摘要
本文叙述在脉冲型高超声速风洞中，用模型自由飞方法测定８°球头钝锥的高超声速静、动稳定特性。采用同步高速摄影方法记录了２０ｍｓ准定常试验时间中模型的角运动并用参数微分法进行气动参数辨识。实验结果表明对质心位置Ｘｃｇ≤０．６０的模型在Ｍ∞＝７．８和Ｍ∞＝９．９两种条件下皆是静、动稳定的，稳定性随质心的后移而下降，在实验范围内马赫数对稳定性没有明显影响，同时模型的底部是否封闭也没有明显影响。
Hypersonic static and dynamic stability derivatives of 8den blunt cones with different nose top were investigated by free flightmethod in a hypersonic impulse type wind tunnel. The angular motion of the models during the quasi-steady flow was recorded by synchroflash and the aerodynamic stability coefficients were derived from the motions by parameter differential method. The experimental results show that the models with relative mass center Xcg≤0.6 are static and dynamic stable both in Mach number 7.8 and 9.9 and the stability derivatives vary with the position of 'lass center. The results also show the model base with orwithout a sealed plate has little or no influence on stabilitics in the experimental conditions.
关键词
高超声速
动稳定性
球头钝锥
风洞
飞行力学
hypersonic dynamic stability
blunt cone
model free flight
parameter differential method
impulse type wind tunnel
