Foreshowing study of dynamic environment on the sphere-cone-cylinder reentry vehicles
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摘要: 考察了超声速和高超声速流场中一类球头锥-柱再入飞行器表面稳定压力和脉动压力的分布特性,利用CFX(Computation Fluid Explorer)软件建立球头锥-柱的外流场域网格,对其进行定常、非定常流场分析,给出一套预测表面稳定压力和脉动压力环境的工程新方法.将该方法与理论和经验估算方法进行了对比分析,验证了该方法的可行性和适用性.同时利用该方法研究了马赫数、来流攻角等因素对再入飞行器表面脉动压力环境的影响.利用ANSYS大型软件建立了再入飞行器导弹头部的动力学分析模型,根据确定的再入飞行器表面脉动压力环境和随机振动分析理论,采用有限元谱分析方法计算得到该飞行器弹头部件的随机振动响应加速度的均方根值和功率谱密度曲线,计算结果满足工程应用的要求.Abstract: The stable and fluctuating pressure distribution on the surface of the sphere-cone-cylinder reentry vehicle was investigated in the supersonic and hypersonic flow field. Computation fluid explorer(CFX )was used to model the grid which had been analysis of three-dimension steady flow and unsteady flow field. Meanwhile the new engineering method of the surface of the sphere-cone-cylinder reentry vehicle was given . Then, the theory and estimation method was compared , which tested and verified the feasibility and applicability of this method . The effect of fluctuating pressure distribution on the surface made by Mach number and attack angle was researched. Taking advantage ANSYS, the model of dynamic analysis of reentry vehicle in missile-s head was created. Meanwhile , according to the method fluctuating pressure and random vibration theory of reentry vehicle, the root mean square(RMS) and power spectral density(PSD) of acceleration response was presented by spectrum analysis, which was very practical and applicable.
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