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今天 09:06
火箭发射不怕雷雨天了——火箭院总体设计部十室和703所合作,通过大量的机理研究和试验,终于找到了用复合涂层进行防护的解决方案。简单讲,就是在防热层表面喷涂一种特殊涂层,在雷电来时激发形成具有导电性的等离子层,把电流分散到直径几十倍的区域里,电流不那么集中了,破坏力就弱了。在两年多的时间里,经过多物理场仿真、缩比试验,近日,研究取得重大突破,完成了1:1火箭整舱段级试验,达到国内外标准规定的试验水平,在200千安雷电电流的作用下,壳体防热层不被破坏。200千安的试验电流意味着,自然界95%的雷电作用下,火箭都可以正常发射飞行,不再惧怕雷电,可以全天候发射了。总体设计部十室电气系统总体设计师陈曦介绍,这项技术称为强电磁脉冲防护研究,具有两点独到之处。目前,强电磁脉冲防护研究是基于固体火箭进行的,因为固体火箭对发射机动性的要求比液体火箭更高。该项技术已经具备工程应用条件,后续还将开展缩比飞行试验集成验证,今后在液体、固体火箭上都可应用。(航天科技一院)
Today at 09:06
Rocket launches are not longer afraid of thunderstorms
The Rocket Academy’s General Design Department and 703 Institute cooperated through a lot of mechanism research and experiments, and finally found a solution for lightning protect with composite coatings. To put it simply, a special coating is sprayed on the surface of the heat protection layer, which would be excited to form a conductive plasma layer when lightning strikes, dispersing the current to an area tens of times the normal diameter, therefore the current would not ve so concentrated, and the destructive power would be weaker.
In more than two years, after multi-physical simulations and scale-down tests, the research has recently achieved major breakthroughs. It has completed the 1:1 rocket whole-stage test, reaching the test level specified by domestic and foreign standards, at 200 kA. Under the action of that lightning current, the heat protection layer of the shell is not damaged. The test current of 200 kA means that the rocket can be launched normally under the action of 95% of the lightning in nature, no longer afraid of lightning, and can be launched all-weather.
Chen Xi, the overall designer of the electrical system in the Tenth institute of the Overall Design Department, said that this technology is called strong electromagnetic pulse protection research and has two unique features. At present, research on strong electromagnetic pulse protection is based on solid rockets, because solid rockets have higher requirements for launch site mobility than liquid-fueled rockets. The technology has already met the conditions for engineering application, and in the follow up, scaled flight test will be carried out for integrated verification, and would be used in both liquid and solid rockets. (First Academy of Aerospace Science and Technology)