钝体俯仰阻尼导数数值计算  

Numerical Calculation of Damping-in-Pitch Derivatives of Blunt Body

作　　者：刘伟[1] 张鲁民[1] 

机构地区：[1]中国空气动力研究与发展中心,四川绵阳621000

出　　处：《空气动力学学报》1997年第4期427-435,共9页Acta Aerodynamica Sinica

摘　　要：分别采用：（1）Euler方程的谐振摄动法；（2）薄层近似的非定常N－S方程模拟有粘扰动流场两种方法计算了钝体外形的高超声速俯仰阻尼导数。通过计算表明：对于复杂外形，方法（1）适用于零攻角附近的流动计算，而方法（2）考虑了流场的粘性作用，能够应用于一般流态（3＜M＜20，0＜a＜20°）的计算。此外，本文发展了文献［6］的动导数转换公式，使之适用于二维转轴情况，并在方法（2）中通过引入“亚迭代”过程提高了非定常流场的计算精度。In this paper, the supersonic damping-in-pitch derivativesof blunt body were calculated with two methods: (1) harmonic perturbationmethod by solving Euler equations; (2) simulant viscous flow field by solving unsteady N-S equations. To complex shapes as the blunt body inthis paper, the calculation showed: the methed (1) can be applied in flowcaIculating around zero attack angle, but the method(2)can be applied ingeneral flow calculating (3<M<20, 0<a<20°).In addltion, this paperdeveloped the transfer formulas of the stability derivatiye of paper[6]and increased the precision of unsteady flow calculation by using subiteration in method(2).

关 键 词：非定常流 俯仰阻尼导数 数值计算 N-S方程 钝体 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程] V211.59