含侧喷流弹丸三维绕流干扰流场数值分析

Numerical studies on three dimensional interacting flow field over projectile with lateral jet

从全Navier Stokes方程出发 ,应用三维隐式有限体积TVD格式 ,在超声速和零攻角条件下 ,分别对无侧喷流和含侧喷流的低阻远程弹丸三维粘性绕流流场进行了数值模拟 ,为避免分区计算而用代数方法生成了弹丸绕流场O型网格 ,计算结果得到了清晰的流场波系结构 ,并从流场波系结构、弹体和弹底表面压力分布等角度将两者进行了对比与分析 ,表明侧喷流不仅提供增程推力 ,而且改变了弹丸阻力特性 ,其结果可用于研究弹丸的火箭增程技术。

Two kinds of external flow field over low-drag and long-range projectile with and without lateral jets were numerically simulated in supersonic speed and zero attack angle. The three dimensional Navier-Stokes equations and implicit finite volume TVD scheme were applied. In order to avoid zonal method, O type grid of single zone was produced by algebraic arithmetic. The clear flow structures was obtained. The two kinds of flow field were compared from shock structure, pressure of body and base, etc. It was shown that lateral jets not only can provide push force, but also can change pressure distribution of the projectile body. The results are very important for the study of projectile with lateral rocket boosters.