JF-12 Hypersonic Shock Tunnel

[cirr]

JF-12 hypersonic shockwave wind tunnel

Operating Mach number: 5-9
Max. duration of test: over 100ms

This is the kind of facilities that enable a country to scale new heights in science and technology。

 

[cirr]

The tunnel uses detonation driving technique in place of free piston driven technology，thereby overcoming the inherent weaknesses of the latter。

http://www.guancha.cn/Science/2013_07_30_162005.shtml

 

[RAMPAGE]

The tunnel uses detonation driving technique in place of free piston driven technology，thereby overcoming the inherent weaknesses of the latter。

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dafuq is this thing ??? can it be used for matter particle's collision ???

 

[cirr]

dafuq is this thing ??? can it be used for matter particle's collision ???

This can be：

Observation of High-Speed Microscale Superlubricity in Graphite

A sheared microscopic graphite mesa retracts spontaneously to minimize interfacial energy. Using an optical knife-edge technique, we report first measurements of the speeds of such self-retracting motion (SRM) from the mm/s range at room temperature to 25  m/s at 235 °C. This remarkably high speed is comparable with the upper theoretical limit found for sliding interfaces exhibiting structural superlubricity. We observe a strong temperature dependence of SRM speed which is consistent with a thermally activated mechanism of translational motion that involves successive pinning and depinning events at interfacial defects. The activation energy for depinning is estimated to be 0.1–1 eV.

Phys. Rev. Lett. 110, 255504 (2013): Observation of High-Speed Microscale Superlubricity in Graphite

Just kidding。

On a serious note，the Americans are keeping a close watch on the progress of this research。

The American Society of Physics have published several key reviews/reports based on the results of the above paper。

Future technology for microelectronics、mobile telecommunication and all that。

 

[RAMPAGE]

@cirr

so no future of anti matter technology ???

 

[cirr]

@cirr

so no future of anti matter technology ???

We are working on it，we are working on it。

 

[cirr]

JF-12 shockwave wind tunnel，the craddle of hypersonic flight vehicles：

CCTV news clips。

 

[cirr]

Video：

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Though in Chinese，still worth watching。

According to the report，great works being done using this wind tunnel。

 

[cirr]

Hydrogen-oxygen detonation wind tunnel

 

[cloyce]

This link : ?????????????? ?????????-????

It says it "全球首座.." or "first globally".

But how about this : Factsheets : HYPERVELOCITY WIND TUNNEL 9

Could someone enlight me?

 

[PWFI]

JF-12 shockwave wind tunnel，the craddle of hypersonic flight vehicles：

It's not JF-17 but an F-16

 

[Maxyu]

First of all,hypersonic wind tunnel is basically a facility transfers high thermal energy to high kinetic energy. That means additional heating is required before the flow enters the nozzle.

The AEDC hypervelocity wind tunnel 9 is continuous wind tunnel with storage heating to promote the total temperature, while the JF12 is a pulsative shock tunnel that utilizes the gasdynamic compression of shock wave to create the high enthalpy and high pressure condition before the nozzle thoat. The former normally suffers from the insanely high expenses for construction, maintainance and every single test shot, with a gain of longer test time and better flow quality of course. The latter, on the other hand, costs much less (10% or less), especially for a detonation driving one, to fulfill the same test missions. And that makes a differnce with the chinese budget.

For shock tunnel, JF12 is definitely the biggest one in the world and the first to reach this big. By big, it includes both nozzle size and the length. The nozzle size is big enough to test a real size model which is important for hypersonic test for there is no available scaling criterion as that in low speed test. The lenght assures the test time of a shock tunnel which is a key concern to the force and moment measurement. In general, force measurement is not allowed in shock tunnel for its short duration, but that's ok for this JF12 becasue it has a test time of 100 ms. By first, I guess it also implies that JF12 is the only one in the world employs a reversely propagating detonation wave to drive the shock tube.

Hope it helps.