Shulou(Shulou.com)11/24 Report--

Thank CTOnews.com netizens for the special commentator and the clues delivered by rain and snow. According to CTOnews.com news on June 5, if you want to do good work, you must first sharpen its tools. Hypersonic is not all aerodynamics, but a complex interaction between the extremely high temperature atmosphere and the surface of the body, and countless problems can only be solved in the wind tunnel system.

JF-22 ultra-high-speed wind tunnel is regarded as the most advanced world-to-earth round-trip system in the world at present. It can reproduce the flight conditions at an altitude of 40km / h and a speed of up to 10km/s, which is equivalent to about 30 times the speed of sound. It is the cradle of a new generation of aircraft in China. According to CCTV news, the JF-22 ultra-high-speed wind tunnel has now passed the acceptance test smoothly.

The National Natural Science Foundation of China organized the acceptance meeting of the national major scientific research instrument development project "detonation driven ultra-high enthalpy shock tunnel" in Huairou Park of the Institute of Mechanics.

The acceptance experts unanimously agreed to pass the acceptance and evaluated that the wind tunnel is in the international leading level in terms of comprehensive performance indexes such as effective test time, total temperature, total pressure and nozzle flow field size.

Jiang Zonglin, a researcher at the Institute of Mechanics of the Chinese Academy of Sciences and head of the Huairou shock tunnel project, has previously said that the goal of the JF-22 wind tunnel is to power the heaven-earth round-trip system, which, if successful, can reduce satellite and spacecraft launch costs by 90 per cent.

CTOnews.com Note: wind tunnel is a kind of pipe-like experimental equipment that can artificially generate and control air flow to simulate the flow of gas around aircraft or objects, and can measure the effect of gas on objects and observe physical phenomena. According to the airflow velocity in the test section of the wind tunnel, the wind tunnel can be divided into low speed wind tunnel (Ma ≤ 0.4), high speed wind tunnel (Ma=0.4~4.5) and hypersonic wind tunnel (Ma ≥ 5.0). In a high sonic wind tunnel, a Ma number of 0.4 to 0.8 is usually called a "subsonic wind tunnel" and a Ma number of 0.8 to 5 is called a "transonic wind tunnel", in which Ma=1.4~5 is called a "supersonic wind tunnel".

The JF-22 ultra-high speed wind tunnel project is supported by the National Natural Science Foundation of China and undertaken by the Institute of Mechanics of the Chinese Academy of Sciences. It can reproduce flight conditions at an altitude of 40 to 100km and a speed of up to 10km / s, which is equivalent to about 30 times the speed of sound.

The project was officially launched in 2018 with a development cycle of 5 years. It is worth mentioning that the JF-22 ultra-high speed wind tunnel and the JF-12 recurrence wind tunnel will together constitute the only ground experimental platform covering all flight corridors of nearby space vehicles.

According to reports, Jiang Zonglin, head of the JF-22 ultra-high speed wind tunnel project, put forward the shock wave reflection forward detonation driving method, changed the "unusable" detonation head into "available" and "easy to use", led the team to build the ultra-high speed shock tunnel technical system, and successfully developed the JF-22 ultra-high speed wind tunnel.

Officials also pointed out that the wind tunnel is a super-large experimental instrument in the field of hypersonic and ultra-high speed, with a total length of 167m, a nozzle outlet of 2.5m, an experimental chamber diameter of 4m and an experimental airflow velocity range of 3-10km/s. It can reveal the law of ultra-high-speed flow of complex media dominated by molecular dissociation, and can effectively support the research and development of space-to-earth transportation system and ultra-high-speed aircraft in our country. It is of great significance to promote the development of aerodynamics and enhance the R & D capability of aerospace high technology in China.

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