摘要
本文从非定常Ｅｕｌｅｒ方程出发，应用谐振摄动法计算了球锥体超声速、高超声速下的俯仰阻尼导数和。Ｅｕｌｅｒ方程的求解利用ＳＣＭ方法和ＭａｃＣｏｒｍａｃｋ的两步算法。文中用任意攻角下不同俯仰轴的气动导数转换公式来简化计算，用较粗网格可以得到较精确的结果，程序编制相对简单。一次计算可以得到定常绕流解及一系列钝头率、不同俯仰轴下的多种动导数结果，在ＥＬＸＳＩ６４００机上约需２０～４０分钟。所得结果与试验结果符合程度令人满意。
Damping-in-pitch derivatives of sphere-cone bodies at super-and hyper-sonic speeds at angle of attack are determined with the assumption of harmonic perturbation. The unsteady Euler equations aresolved by means of SCM method and MacCormack's two-step algorithm.The numerical results have good consistence with the existing experimentaldata,and the method is valid in wide range of attack angles,reducedfrequencies,and the ratio of bluntness.In addition,a set of transfer rela-tions of the stability derivatives between pitching axes in the case ofattack angle are developed.
出处
《空气动力学学报》
CSCD
北大核心
1995年第2期132-142,共11页
Acta Aerodynamica Sinica
关键词
稳定性导数
非定常流动
球锥体
超声速流动
stability derivatives,unsteady flows,sphere-cones,supersonic flow,hypersonic flow,perturbation.
