弹丸跨声速粘性绕流数值计算

Computation of Transonic Viscous Flow of a Projectile

用数值模拟方法研究弹丸跨声速绕流的流动特性，数值模拟的出发方程为平均雷诺数的Ｎ－Ｓ方程，湍流模型采用Ｂａｌｄｗｉｎ－Ｌｏｍａｘ模型，数值格式为四阶的ＭＵＳＣＬＴＶＤ格式。通过数值模拟研究弹丸在Ｍａ∞＝０９６状态下，绕流流场的流动特性，给出流场的等马赫数线、等压力线、弹底速度矢量分布及弹体表面压力分布与实验的对比。结果表明，计算符合实际情况。

The characteristics of a projectile flow at transonic speeds are investigated by a numerical method.The governing equations are the Reynolds averaged N-S equations, Baldwin-Lomax model is adopted for turbulence flow. The numerical scheme is fourth order MUSCL TVD scheme ,and the characteristics of a projectile flow is computed at M a∞ =0.96 .The Mach contour ,pressure contour ,longitudinal surface pressure distribution,velocity vectors in the base region are offered.The result is in good agreement with the actual condition,and sastified with the requirements of project.