The J-20-engine discussion is over and other speculative topics ... to separate from the J-20-news !

[Figaro]

So we now have at least two documentaries confirming a domestic, Chinese-made engine.

Documentary 1:

Documentary 2:

What evidence do the AL-31 supporters have?
Nozzle appearance?
Anything else?

There are both subtle and obvious appearance differences. Ppl were claiming that the original J-20 was using Al-31F's; it then changed its nozzles in later prototypes and LRIP models. Then, people claim that the J-20 changed to a later variant of AL-31F just by eyeballing it. I think we really ought to be more open about the prospects of domestics engines.

And that alone is wrong. The first J-20s were handed over already in late 2016 and transferred to Dingxin.

So, as I and my friends say, these guys at CCTV usually rely on internet reports and rumours in the same way we do and even if CCTV-7 is de facto official, they would not reveal such sensitive information nor will they correct any BS another CCTV-channel reports.

Deino

But they "officially" were inducted into service in March 2017. Before that, they were used for testing and extensive evaluation until CCTV announced their induction. If you do not consider CCTV-7 to be credible, then we ought to dismiss any Chinese state media, including the official PLA daily.

There are both subtle and obvious appearance differences. Ppl were claiming that the original J-20 was using Al-31F's; it then changed its nozzles in later prototypes and LRIP models. Then, people claim that the J-20 changed to a later variant of AL-31F just by eyeballing it. I think we really ought to be more open about the prospects of domestics engines.


But they "officially" were inducted into service in March 2017. Before that, they were used for testing and extensive evaluation until CCTV announced their induction. If you do not consider CCTV-7 to be credible, then we ought to dismiss any Chinese state media, including the official PLA daily. The fact that most of us get our pictures or video clips from CCTV-7 really explains a lot of its credibility. The same channel also aired the recent documentary of the Type 002 carrier ... should we also dismiss it as being fake?

There are both subtle and obvious appearance differences. Ppl were claiming that the original J-20 was using Al-31F's; it then changed its nozzles in later prototypes and LRIP models. Then, people claim that the J-20 changed to a later variant of AL-31F just by eyeballing it. I think we really ought to be more open about the prospects of domestics engines.


But they "officially" were inducted into service in March 2017. Before that, they were used for testing and extensive evaluation until CCTV announced their induction. If you do not consider CCTV-7 to be credible, then we ought to dismiss any Chinese state media, including the official PLA daily.

The same CCTV channel released the recent documentary about the 001a carrier and showed us exclusive photos and official documentation ... should we also dismiss it as being incredible?

Nope !
To admit the guys I know are not the typical big shrimps and they are surely not bloating around what they know. They are calm, careful in the way they answer, respectful and so far they were never deliberately wrong with anything answer they gave me.

As such some might call this ignorant, arrogant or plain stubborn ... I call it careful.

If You and others agree, then it's fine but out of the three options on the table (AL-31-derivate, WS-10-variant, WS-15) they all rejected the WS-options and even if ball were quite undecided with my theory, they all prefer my option. But we will see.


Deino

Deino, I still agree with your opinion to an extent: if the J-20's using a Russian engine, then more than likely it is using the powerful AL-31FM-2 (not the underpowered series 3). I'm not attacking the "Big Shrimps" here; I have been following them around for years and have relied substantially on their rumors. But I believe CCTV undoubtedly holds more credibility than any "Big Shrimp" because they are state backed and have access to confidential information. The recent and widely circulated documentary on the Type 001a carrier was produced by CCTV; it showed very exclusive photos and even provided its official designation, 002, which no shrimp managed to quote.

"why don't you provide us an image of the WS-15's nozzles in depth? Maybe then we'll believe your 3D 210kn thrust vectoring engine theory ..."


View attachment 420863 View attachment 420861 https://defence.pk/pdf/threads/chen...news-discussions.111471/page-439#post-8892490
View attachment 420860

These images show, the Chinese President tries out the TVC nozzle, around 2003.

View attachment 420865

The nozzles are obviously tilted.

View attachment 420863

https://defence.pk/pdf/threads/chen...news-discussions.111471/page-462#post-8986993
Differential tilting

View attachment 420864

https://defence.pk/pdf/threads/chen...news-discussions.111471/page-515#post-9142934View attachment 420866

I admit the seeming tilting are moderate compared to what we have seen on the Russian Flankers with TVC.

Some one has suggested those seeming tilting of the nozzles are purely due to optical illusions, but no one has provided some pictures of different aircrafts, that has this "optical illusions".

Asok, if you want to provide better evidence, you should at least not use a ridiculous TVC demo when Jiang Zemin was around (the PLA in the 90's had no way to build thrust-vectoring engines). Please make it more believable.

 

[Asoka]

"Asok, if you want to provide better evidence, .."

I did provide solid photographic evidences, all the other pictures are showing the nozzles were moderately tilted, some even differentially.

TVC are not exceptionally difficulty to built, both US and Russia mastered it, in the 1990's. The Harriers and Yak VTOL aircrafts have them for decades.

"the PLA in the 90's had no way to build thrust-vectoring engines. Please make it more believable."

The TVC demo in front of the President were in the 2004 Zhuhai Airshow. If you can read the Chinese caption below the picture, you would have know
.

You are just demonstrating typical western ignorance and arrogance. No wonder the CIA and Pentagon were ONE WHOLE DECADE OFF in their estimates of the initial appearance of J-20. By their estimates, China should not have J-20 flying for another 2.5 years.

Western Intelligences are full of people like you, who don't know Chinese, and are not well versed in the respective technologies, they want to analyze.

 

[Figaro]

"Asok, if you want to provide better evidence, .."

I did provide solid photographic evidences, all the other pictures are showing the nozzles were moderately tilted, some even differentially.

TVC are not exceptionally difficulty to built, both US and Russia mastered it, in the 1990's. The Harriers and Yak VTOL aircrafts have them for decades.

"the PLA in the 90's had no way to build thrust-vectoring engines. Please make it more believable."

The TVC demo in front of the President were in the 2004 Zhuhai Airshow. If you can read the Chinese caption below the picture, you would have know
.
View attachment 420877

You are just demonstrating typical western ignorance and arrogance. No wonder the CIA and Pentagon were ONE WHOLE DECADE OFF in their estimates of the initial appearance of J-20. By their estimates, China should not have J-20 flying for another 2.5 years.

Western Intelligences are full of people like you, who don't know Chinese, and are not well versed in the respective technologies, they want to analyze.

WHERE? There is no evidence , yet you keep insisting on so. In 1997, Western intelligence accurately predicted that the J-XX program would come online in 2 decades or 2017. While Robert Gates initially said 2025 as an induction date for the J-20, he later revised it down to 2018 because he realized he was wrong.

 

[Figaro]

Seems like you are not familiar with Chinese people. Do you feel moral superiority to paint the Chinese as ignorant and arrogant? Although I disagree with Asok's assessment of J-20, I find your perception of Chinese people grossly misguided and revealing. Your comment only reveals your own ignorance and arrogance on Chinese people. I would never judge an individual based their group and vice versa.

I wouldn't jump that far. Mr. @Pakistani Power does believe in Chinese ingenuity and how the J-20 has a domestic engine (WS-10 variant). Any experience Chinese forummer would criticize Asok's arguments from a mile away ... just because Pakistani Power does not agree with the WS-15 doesn't mean he's being "racist" towards Asok ..,.

 

[Cybernetics]

I wouldn't jump that far. Mr. @Pakistani Power does believe in Chinese ingenuity and how the J-20 has a domestic engine (WS-10 variant). Any experience Chinese forummer would criticize Asok's arguments from a mile away ... just because Pakistani Power does not agree with the WS-15 doesn't mean he's being "racist" towards Asok ..,.

Totally agree with the notion of criticism on Asok's arguments. Don't "quote" words I didn't even say. I didn't mention it was ""racist"" or think Pakistani Power is a racist, but his statement was very disrespectful and and offensive to Chinese people.

Personally I think the WS-15 is yet to be seen on the J-20.

 

[Ultima Thule]

Seems like you are not familiar with Chinese people. Do you feel moral superiority to paint the Chinese as ignorant and arrogant? Although I disagree with Asok's assessment of J-20, I find your perception of Chinese people grossly misguided and revealing. Your comment only reveals your own ignorance and arrogance on Chinese people. I would never judge an individual based their group and vice versa.

Dispite my disagreement with Asok's stubborn insistence on certain characteristics of J-20, I feel this is a forum for sharing opinions and ideas. There isn't any new content out on the J-20 so I understand members' frustrations. Please refrain from taking out your frustrations upon whole groups of people, its arrogant, ignorant, disrespectful, and people on this page do take offense. Attacking ideas is welcomed but attacks upon individuals and groups are not welcomed.

@Asok has too much false assertions rumors how can he prove that WS-15 has a TVC, 210kn thrust and based on R-79 jet engine and @Asok always contridic himself in past he was saying that j-20 using WS-15 from day one and on the few pages back he was saying that j-20 was using WS-15 from 2015

Totally agree with the notion of criticism on Asok's arguments. Don't "quote" words I didn't even say. I didn't mention it was ""racist"" or think Pakistani Power is a racist, but his statement was very disrespectful and and offensive to Chinese people.

Personally I think the WS-15 is yet to be seen on the J-20.

I don't point Chinese nation, Chinese our brothers i specifically point @Asok who acting like a insane

 

[sinait]

@Asok has too much false assertions rumors how can he prove that WS-15 has a TVC, 210kn thrust and based on R-79 jet engine and @Asok always contridic himself in past he was saying that j-20 using WS-15 from day one and on the few pages back he was saying that j-20 was using WS-15 from 2015

I don't point Chinese nation, Chinese our brothers i specifically point @Asok who acting like a insane

Asok assertions about WS-15 is far fetched but not entirely disproved.
Asok also has made some valid points.
Let him have his say, no need for resort to insults.

On introspection, you will realize your post did refer to all Chinese, though I believe it is unintentional.
.

 

[Ultima Thule]

Asok assertions about WS-15 is far fetched but not entirely disproved.
Asok also has made some valid points.
Let him have his say, no need for resort to insults.

On introspection, you will realize your post did refer to all Chinese, though I believe it is unintentional.
.

What valid points I'm asking that valid points from @Asok at least from 6 months can you give me those valid points

 

[Figaro]

Asok assertions about WS-15 is far fetched but not entirely disproved.
Asok also has made some valid points.
Let him have his say, no need for resort to insults.

On introspection, you will realize your post did refer to all Chinese, though I believe it is unintentional.
.

I disagree with Asok's perspective that "foreigners" will never be able to understand Chinese military matters because of the "language barrier". On the other hand understanding the language will give you a time and depth advantage on understanding key technologies of Chinese weapons systems and the dreaded rumours. It is true that Chinese military research is mainly or entirely published in Chinese because many Chinese researchers themselves suffer from the "language barrier". They publish in the language that is most usable to them, they feel Chinese is the easiest language for them to communicate complex ideas in and also the best language for their primary readers(Chinese military industrial complex) to understand. Same can be said of rumours, people who have personal access to rumours tend to be Chinese from China, who are generally not English speakers (not their fault). Over time some information will trickle down into English reports translated by people who understands both languages, but this takes time and not all information will be translated due to lack of translators and their time. English speaking experts get their understanding of Chinese weapons systems from reading Chinese reports too. Understanding Chinese does gives an advantage but its not absolute. Insisting that a "foreigner" can never understand is demeaning and dismisses human potential to adapt, a broad generalisation I do not condone.


He can't prove anything definitively, I think some where back Asok said it was based off rumours from a Chinese language forum. New information trickling down should be welcomed, I would feel bad if any members feel unconfident in sharing new information they have discovered, its a treasure for all of us to enjoy, even if they are just rumours. Many members have already dismissed the rumour but no need to shoot the messenger. If anyone thinks another's opinion/assessment is not in line with your own then just stay strong and be confident with yours. I understand the process of disproving another person can be frustrating especially if they feel its the right idea, sometimes its best to let the time pass until more information is present and read another thread. Lets stay civil and not have a civil war.

You're completely missing the point here. Asok's claims are ridiculous; he says that the J-20 is using a 3D thrust vectoring WS-15 with a thrust of at least 210kN. He deduces these claims from Youtube videos, anecdotal evidence, and very unreliable articles. Ask yourself, has he ever found a decent picture of the WS-15's engine nozzles? No one is deliberately being rude or "racist" to Asok here; we are just asking him for proof and since he can't give any, he regurgitates the same *flawed* argument. If Asok provided a tiny bit more evidence, perhaps we would have supported his assertion. Regarding your first portion, Asok was bashing on how "foreigners" like Deino could not become "true" Chinese military enthusiasts simply because of the perceived language barrier. Instead of attacking us for critiquing Asok's argument, perhaps you could also attack him for his intransigent attitude about non-native Chinese speakers? You're really arguing against the wrong person here ...

Asok assertions about WS-15 is far fetched but not entirely disproved.
Asok also has made some valid points.
Let him have his say, no need for resort to insults.

On introspection, you will realize your post did refer to all Chinese, though I believe it is unintentional.
.

Asok also has made some valid points.
Kindly show where? The only valid point I see him making is that the J-20's did not engage afterburners during the Zhuhai demo (hence arriving to his conclusion that the J-20 is using a powerful engine, albeit not WS-15). The fact that Asok has not provided conclusive evidence really undermines his premise ...

 

[Figaro]

Some years from now, I will remember Oct 2016 to Now, was one of my intellectually most active and interesting period.

To solve the mystery of J-20's engine, I was intensely pulled into understand how Jet Engine and how aircraft fly.

Sometimes, I spend more than 10 hrs a day on it. I must have downloaded and read over 100 technical papers and articles, on these subjects. Not very amusing for my wife and daughter to see me, constantly, glued to the monitor, reading those papers.

Before, I didn't even know how a jet engine works, how the airplane controls works, not even know how the wings of generates lift, despite a life long interest in airplane. I was just looking at pretty aircraft pictures. I am ashamed to admit.

Thank you for being my worthy debate "opponent"!

It takes another stubborn person, to get the best and worst, out of another stubborn man.

I have insisted that there is a War of Deception going on, being waged by the Chinese over J-20.

There is a chance, that the continuous public disclosures of J-20 is diversionary tactic, designed to divert attention, away from the even more secretive H-20, strategic stealth bomber project.

To admit being fooled is not easy. The Chinese have fooled the fanboys, the CIA and Pentagon, big time, over the J-20 project.

They have fooled Mr. Robert Gates into cancel the formidable F-22, and put their money on the lesser F-35, thus forfeited their Air Superiority and air dominance, that the US has enjoyed since WWII.

I really doubted US would have cancelled F-22 at 187 units, if they knew, what they knew now.

Now, they can either reopen the F-22 production line, which takes 5 years even with no major upgrades, or bet their money on the sixth-generation fighter, which may take another 15 years, like F-22 and F-35.

There is no guaranteed, that China won't beat US and Russia to it, and produce a better sixth-generation, at an earlier date.

Either case, US have forfeited its Air Superiority over China. There will be no more generation gap between US and China air forces.

Their air powers' quality and quantity will be at PARITY, in the near future.

If the US has kept their production goal of 800+ F-22, China will not have 800 J-20 for another 10-15 years, and US would still have their Air Superiority.

And since the F-22's production line is still open, if it weren't canceled, US could keep increase the production F-22, past 800 units, and keep making continuous upgrades, like the F-15 and F-16, at the expense of F-35, in order, to keep up with J-20's production.

There would be no danger of losing the Air Superiority to China.

Now, US faces the prospect of 184 F-22 against 500-1000 J-20, in the next 10-20 years.

And J-20 will keep improving, at a rapid rate, while F-22 will not.

Sometimes, I spend more than 10 hrs a day on it. I must have downloaded and read over 100 technical papers and articles, on these subjects.
Show us at least one of your documents? If there are hundreds of them, surely you would be generous enough to share them with us ... it would be more than appreciated! Please

 

[Asoka]

My personal opinion is it was not based on the previous documentary which had blurred images of machinery in the workshop producing the components. They deleted it because it was showing too much information on the production lines, anyway, this is the second confirmation of a domestic engine. I am not sure how else we can prove this point, CCTV is the official tv station of PRC. Even with new images, we can only deduce like always, now they are officially telling us it is CHINESE.

"Now, they are officially telling us, it is a CHINESE [engine]. . ."

 

[Figaro]

"Now, they are officially telling us, it is a CHINESE [engine]. . ."

Please post your reports ... I would love to glean off your documents

 

[Ultima Thule]

"Now, they are officially telling us, it is a CHINESE [engine]. . ."

CHINESE engine doesn't mean that its WS-15 @Asok its maybe higher thrust version of WS-10X

My personal opinion is it was not based on the previous documentary which had blurred images of machinery in the workshop producing the components. They deleted it because it was showing too much information on the production lines, anyway, this is the second confirmation of a domestic engine. I am not sure how else we can prove this point, CCTV is the official tv station of PRC. Even with new images, we can only deduce like always, now they are officially telling us it is CHINESE.

domestic engine doesn't mean that surely its a WS-15 but may be higher thrust version of WS-10X

 

[Figaro]

CHINESE engine doesn't mean that its WS-15 @Asok its maybe higher thrust version of WS-10X


domestic engine doesn't mean that surely its a WS-15 but may be higher thrust version of WS-10X

@PP, I really think you should cut down with the highlighted/bolded letters. You're making some members very agitated ... respond to Asok just like he does to you ... without the fanning fire. While Asok's premise is flawed, he responds courteously, as should you.

 

[Asoka]

Whenever, I mentioned that J-20's Engines, already has 3-D TVC (AVEN) Nozzles installed, I was met with howling laughers, ridicules, and outright disbeliefs, as if this is some exotic technology, that the Chinese will never able to crack, much less, it is already installed on the J-20.

A casual search on Google, with the right Chinese Keywords, for the AVEN technology, pull up numerous technical articles, written by Chinese researchers for their colleagues. Most of those technical articles, were published in Chinese Journals, in the 1990's and early 2000's.

The AVEN technology was first demonstrated in early 1990's by the F-16 MATV. And it was publicly demonstrated or presented, to the Chinese President, at the 2004 Zhuhai airshow.

This article here was first published, in 2002, in China's Aviation Engine Journal. It described the development process and methodology of how China was able to crack the (Axis-symmetric Vectoring Engine Nozzle, AVEN) technology. The author was an insider, who worked directly with China's AVEN project.

This article was republished, 2008 in this website, http://ido.3mt.com.cn/Article/200806/show1006412c30p1.html, under the title "China's F-22 will appear soon: Axis-symmetric Vectoring Engine Nozzle Experiments Exposed."

Somebody, @Figaro, has claimed that he can understand technical articles translated from Chinese to English by BING's machine translation service. Well, I am going to post the translation here. If he still claim he could understand it, I take my hat off to him.

" F22 will launch in China : plane axisymmetric vectoring exhaust nozzle test exposure !"

1 aircraft vector thrust technology is by changing the exhaust direction more steering torque technology for aircraft.Plane thrust vectoring fighter through application of the technology of ultra mobility, STOL, and low detectability, greatly increase the fighter's combat effectiveness and survivability. Developed countries such as the United States, Russia as an important priority.

Aircraft vector thrust technologyStudy, changing the exhaust direction, namely, thrust-vectoring nozzleResearch is a key and decisive part, you must firstResearch and development. Axisymmetric vectoring exhaust nozzle (AVEN) was developed from conventional mechanical-divergent nozzle of a thrust-vectoring nozzle through the diffuser nozzle deflection change the exhaust direction. The entire aircraft vector thrust technology, AVEN features with a simple, light weight, low-risk, small modifications to the aircraft, engine host requirements, is to implement the best nozzle for thrust vectoring technology programme. AVEN technologyResearch goal is the completion of the target platform development of turbofan AVEN test, and thermal testing

Transfer from; Sina air force Forum
2 Research objectives and approach

AVEN to in keep axisymmetric received spread nozzle area and area than regulation function of based Shang implementation diffusion paragraph of deflection, and other mechanical device of important difference is AVEN is a complex of space more freedom movement mechanical, people most care of is how makes such of mechanical device movement up, how achieved deflection, how guarantee deflection Hou many of, and mutual make stack of component coordination movement and not card delay, how determine right of movement law. SoResearch ideas from capturing movement mechanism of manpower, from computer simulations to model when the model succeeds, immediately decide on the unit converted to I: 1 prototype, thus overcoming the thrust-vectoring nozzleStudy of key technologies--motion mechanism.

As AVENStudy on technical difficulty, lack of domestic technical reserves, no similar mechanism for reference, it is impossible to ascertain the need to address the key. In view of this situation, through self-reliance, step by stepApproach from computer simulations to model, from the model to the physical, from cold to hot, and key technology of phased decomposition, by technical measures, and, if necessary, by computer simulation or test-test methods for authentication, andStudy on the next phase of decomposition technique, and so development, gradually capturing the key stages in the AVEN, finally accomplished the goal platform turbofan AVEN and the test of thermal test.

AⅥ is one of the test piece pneumatic, organization, structure, strength, control, materials and processes, and many other technologiesResearch topics, each have a large number of innovativeResearch, engineering and technical coordination of multiple projects in parallel across both research quality have made great gains.

3 computer simulation

AVEN is a complex mechanism with multiple degrees of freedom motion of space, typical of AVEN mechanism about 200 motion artifacts, more than 300 pairs these components in an annular space overlap movement only by artificial meansStudy of its mechanism and their relationship is impossible. Throughout the AVEN during the test part, using computer simulation technology, complete mechanismResearch, design and Assembly process of movement members checks, and many other technical work not only effectively reduce theResearch cycle, improve the accuracy of structure design.

3. 1 movement mechanism simulation

? AVEN Zi language dynamic simulation software of the main moving components,Study of AVEN mechanism, the main movement of the moving components, A9, diffuser and nozzle of the operating cylinder's position, so as to give position and control law of AVEN.

3 2 simulation

AVENDuring the study, especially full-scale development of cold and hot test, computer simulation technology, in accordance with the following procedure, complete closed-loop design of AVEN:

(1) according to the aerodynamic design and structural design of movement mechanism simulation results;

(2) press agency programme for the true size of the initial 3D computer solid modeling, computer Assembly simulation entities, and AVEN entities by computer simulation, check the reasonableness and accuracy of the movement of the structure;

(3) the principal bearer of strength design of 3D models available to strength and rigidity checking and preliminary structural strength;

(4) was given control, hydraulic system and controller of parallel program design;

(5) the design of closed-loop process, after more or less after a few repeated, structural design optimization, subsequent design after a few repeated, structural design optimization, design has a good foundation. After the completion of engineering design of the main components, according to the 3D simulation of the real structure of AVEN, verify the correctness reasonable structure design of XING and control and inspection of parts assembling technology of processing performance and test performance.

In accordance with the design process can be completed by the hardware processing virtual Assembly and virtual testing, effectively excluding most of the set 10 blind spots and blunders, which greatly improves the quality of the test pieces, shortening the development cycle, saving research funds.

In these simulations based on the preparation of AVEN mechanism design and motion simulation software, can be done quickly and accurately design and optimization of AVEN

4 motion mechanism and model test

Verify the validity of movement mechanism simulation results, and furtherStudy on the AVE. N motion, starting a cold motion mechanism and model for test development and test.

First of all, AVEN diffuser scaled motion mechanism test is completed,Research on motion control performance and coordinating relations of the deflection movement of main members thereafter, Ling State of the actual engine size prototype has been developed,Study of AVEN mechanism, mechanism of structural feasibility and structure of each agency implementation approaches,Study and validation of control and control system. Based on the above two sets of test development and test and verify the validity of movement mechanism simulation results obtained direct and clear understanding of AVEN mechanism; mastered the methods of AVEN; finding optimized vector angle of approach; completed a level, development of semi-automatic controller; determine the next step is to solve the key technical.

5 capturing key technologies and by hot testing-test

Cold testResearch based on L2 demands according to the aircraft sector and technical achievements of previous work, break down the key technology, completed the thermal test and control system design, construction and the apoptosis, realized in platform AB of turbojet engine test. Hot bench test, 8 main technical key is verified, namely aerodynamic performance, structural design, strength and rigidity analysis, automation, materials and processes, cooling and heat insulation, sealing and sealing, testing and commissioning, solutions are successful for AVEN technology demonstrator developed by China laid a solid technical foundation.

6 technical validation and improvement of thermal test

Thermal test has conquered the 8 key techniques on the basis of
To conquer 4 key technology, improved thermal test is developed, completed two phases of testing. 5,580 vector was completion of the first stage of the test cycle, testing showed that the test in complete inherits all the success of two batches at the same time, to capture the four key technology is designed, AVEN indicators have fully reached the Jets 12 requests from departments. Due to the restrictions of the test bench, the AVEN hot testing cannot be comprehensive test, for this reason, the test bed for the adaptation, added to the test of three-component force measuring system. In a three-component force measuring system test bench, to increase improved thermal test vector angles, increase the number of vector cycle testResearch on maximum AfterBurner vector angle of 21 degrees, thermal vector cycles 10,026. Trial run proves AVEN thermal test piece has a certain degree of reliability.

Meanwhile, gets the key components of the temperature and stress distribution and thrust characteristics of test data.

7 hot testing standards of the target platform after the above work has been carefully analyzed, based on three basic pneumatic scheme and optimization of two basic structural analysis identifies the target platform AVEN final programme and the need to overcome the difficulties

Two AVEN AVEN has inherited the former all the technical measures of success. Improved all shortcomings and finally accomplished the goal platform AVEN AB test. AVEN has maintained the target platform and the target platform similar to that of the nozzle aerodynamic characteristics, control and installation interface, good interchangeability. Test results show that target large adjusting range and high load conditions? long teach ˋVEN  Kan Chang campaign flexible and accurate, nozzle seal well and the system is reliable and effective and targeted platform
AVEN has brand new small integrated digital control systems, and the safety and reliability of emergency system.


Target platform AVEN meets the following specifications:

(1) deflecting azimuth: 360 degrees;
(2) vector angle: 17 degrees ~20 degrees;
(3) the deflection rate: Wx = 120 degrees ~180 degrees/sec, Wy=Wz=45-60 degrees/s;
(4) the incoming force structure, overall dimension aircraft requirements;
(5) set up emergency control system reset device.

AVEN's test results showed that the target platform:

(1) nozzle adjustment range full engine host requirements.
(2) the incoming force structure to withstand high thrust levels of load
(3) A8 is designed correctly. Using the digital electronic controller
3) A8 design. Original AVEN A8 digital electronic controller automatic control of fully compatible with the original control system, no need to change.
(4) The A8 and A9 can be controlled individually and according to the relationship between a given linkage, coordinate very well.
(5) A9 realizes miniaturization, digitalization, integration of control systems, stable and reliable.
(6) elements, such as seals, adjust work reliably.
(7) AVEN emergency reset functions is safe and reliable
(8) in the engine asked, part small AB, AB and AB, AVE n-deflection nozzle and aerodynamic parameters of hosting matches in the work is good, the mechanical system is stable,
(9) overall dimension and aerodynamic aircraft requirements.
(1O) test measured success in various State vector
Force, the main component of effectiveness of the temperature and stress distributions and engines.

Turbofan axisymmetric vectoring exhaust nozzle test indicates that the hot test measures to solve the 11 key technology is successful, thrust-vectoring nozzleResearch up to a new level.

8 concluding remarks

AVEN to maintain the existing divergent nozzle of the engine all the features, and control the same way to finalize the axial symmetry of the AVEN will replace the existing divergent nozzle, 3 half-plane has a tactical advantage.

Similarly, the AVEN according to push more than 10, pushing more than 12, pushing more than 15 engine requirements for the design, as a push than 10, pushing more than 12 a standard nozzle, push the ratio of 15, our 4th-generation fighter with higher mobility, enhance our national defence air force. Aircraft vector thrust technology can be applied in the shipborne aircraft and are expected to be developed for shipboard dinner STOL aircraft and general layout of vertical take off and landing ship-borne aircraft (General layout of vertical take off and landing of aircraft taking off and landing in a similar way to launch vehicles, mobile landing platform helicopters taking off and landing on the platform or medium ships and landing).

Aero-Engine modified with a thrust-vectoring nozzle, as a new type of ground effect aircraft or ground-effect boat momentum will greatly improve its ability to surprise, mobility and living our?Study on application of new methods, such as computer simulation technology and new materials (Ni3AL)Research and new technologies (such as superplastic forming and diffusion bonding)Research, on the development of national defense technology and civilian technology will play a role in promoting.


First author: Jia Dong, senior engineer, graduated from Northwestern Polytechnical University was born in 1967 ***7 month Afterburner axisymmetric vectoring nozzle of adjustable nozzles, and the development of CADResearch work has received the 2001 Award for technology and innovation of the Communist Youth League and the China Aviation Group, first prize of the 2001 Commission of science and technology and other."