圆柱形弹丸绕流流场数值分析

Computation and Analyse of Flow Field of Column-Shape Projectile

用数值模拟方法研究圆柱形弹丸绕流流场特性 ,出发方程为雷诺平增多的 N-S方程 ,湍流模型为 k-ε两方程模型 ,数值格式为二阶迎风格式 ,得到了圆柱形弹丸在亚、跨和超音速下的绕流流场结构和阻力系数 ,并在此基础上给出了圆柱形弹丸头部阻力系数近似解析计算公式 ,与数值计算方法结果对比证明 :其计算精度可以满足工程设计的要求。

The characteristics of flow field of column shape projectile is investigated. The governing equations is the Reynolds averaged N S equations, k ε model is adopted for turbulence folw. The numerical scheme is second order windward scheme, and the characteristics of projectile flow and air resistance coefficient are computed at subsonic? transonic and supersonic. The approximately formula of air resistance coefficient on the head of the projectile is obtained. The result using the approximately formula of air resistance coefficient is consistency with the results by numerical method. so we think that the approximately formula of air resistance coefficient on the head of the projectile could be used in design of project..