超音速弹体底部流动特征的数值分析

Numerical Analysis of Base Flow in Supersonic Projectile

对超音速弹体底部流动特征分三种状态进行了数值模拟。一种是底部不排气状态,一种是底部亚音速排气状态,另一种是底部超音速排气状态。经解这三种状态和外部超音速绕流混合流动的流场控制方程组,得出的数值模拟结果表明,数值精度合理,能有效地分析底部诸状态下流场流动特征,为提高射程和精度提供判断依据,为此类底部流动特征提供了一种预测方法。

This study presents three kinds of numerical analyses of base flow in supersonic projectile. Firstly, there isnlt gas flow from projectile base, secondly. there is subsonic gas flow from projectile base, and twerdly, there is supersonic gas flow from projectile base. In this paper, it is used to sdve the mixture flow Eulen equations from the three kinds of conditions and the external supersonic flow by a finite difference method. These simulation results are resonably accurate and can analyse the many kinds of base flows, provide a kind of wethod for improving range and accuratly. A predictive method for such folw problems is presented.