高超声速风洞变雷诺数试验技术研究

为满足高超声速飞行器气动力雷诺数效应研究需求,在CARDC的Φ1米高超声速风洞中开展了变雷诺数试验技术研究.该项试验技术是利用Φ1米高超声速风洞采用高压下吹-真空抽吸驱动运行方式、风洞运行参数范围宽的特点,通过宽范围内调节风洞运行总压而大幅改变模拟雷诺数.研究采用了单点变雷诺数试验技术和连续变雷诺数试验技术两种手段来开展高超声速飞行器气动力雷诺数效应模拟.单点变雷诺数试验是通过一系列不同雷诺数条件、不同试验车次的试验结果,获得气动特性随雷诺数的变化规律;连续变雷诺数试验时,控制风洞总压从高到低连续变化,测量获取模型处于某一姿态角条件时气动力随雷诺数的变化规律.本文介绍了变雷诺数试验的风洞开车方式、试验及数据处理方法等,并开展了某升力体飞行器和某弹头模型雷诺数效应试验研究.研究结果表明:采用单点和连续变雷诺数试验技术相结合的方式,能较为完整、准确地获得飞行器模型气动力随雷诺数的变化规律.

Research on the test technique of Reynolds number variety in a hypersonic wind tunnel

Research on the test technique of Reynolds number variety is conducted in theΦ1 m Hypersonic Wind Tunnel in CARDC to fulfill the needs of Reynolds numbers effect simulations for hypersonic vehicles.Because the run-mode of theΦ1 m Hypersonic Wind Tunnel is high-pressure and vacuum-pumping,it owns a wide range of operational condition,the test Reynolds number can be changed by the way of stagnation pressure changing.The test technique of Reynolds number change consists of two types:single-point Reynolds number change method and continuous Reynolds number change method.The single-point Reynolds number change method keeps the stagnation pressures a fixed value to obtain aerodynamic coefficients with different attitude angles.The continuous Reynolds number change method keeps test model with a fixed attitude and continuously change stagnation pressure from high to low to obtain aerodynamic coefficients with different Reynolds number.The run-modes of wind tunnel,test measurement and data process method are presented in detail,and the validation tests of a lifting-body aircraft and a missile models have been presented. Combining continuous Reynolds number change method with single-point Reynolds number change method,we can completely and accurately obtain the aerodynamic characteristics of hypersonic vehicle with Reynolds number changing. The test results show the application prospect of this test technique.