小不对称再入体滚转气动力测量技术

Experimental technique for rolling aerodynamic of slight asymmetric re-entry body

为了解决小不对称再入体滚转气动力测量问题 ,北京空气动力研究所研制开发了以空气轴承为核心的滚转气动力测量技术 ,利用空气轴承自身旋转阻尼非常小的特点 ,使模型做自由滚转运动 ,一个特殊设计的非接触的光学测量系统测出模型的转角随时间的历程 ,用参数拟合的方法得到滚转力矩的大小和方向。为验证该项实验技术的正确性与可靠性 ,在5 0 0高超声速风洞中对 4个模型进行了吹风实验 ,吹风马赫数为 5 ,测量滚转力矩系数Cl0 和滚转阻力矩系数Clp。实验结果表明 ,该文方法数据合理 ,并较其它方法更具有鲁棒性。

In this paper,an experimental method for small rolling aerodynamics moments is presented.This method is based on gas bearing.The rolling damping of the gas bearing is very small,the model can rotate with very small rolling damping.The optical fiber speed measurement system can test the change of rotation speed of the model.According to the change of the rotation speed,the rolling moment can be deducted.Several experiments have been conducted in  500 wind tunnel in BIA,the testing Mach number is 5.The results show that for some models the rolling moment coefficient C l0 has the magnitude of 10 -7 ～10 -5 ,the rolling damping moment coefficient C lp has the magnitude of 10 -3 ～10 -2 .Compared with other methods,this kind of technique is more robust.