一种基于数值虚拟飞行技术的弹丸稳定性评估方法

A Estimation Method for Projectile Stability Based on Numerical Virtual Flight Technology

基于数值虚拟飞行技术,采用动态嵌套网格,耦合求解非定常N-S方程和六自由度刚体运动方程,发展了一种能够考虑非定常气动效应的弹丸稳定性评估方法。通过对典型外挂物投放标模和BRL的M852子弹标模进行数值模拟,验证了数值方法正确、有效,可以用于数值虚拟飞行模拟。最后对某质量模拟弹丸进行了虚拟飞行模拟,给出了不同扰动情况下的落点散布和飞行稳定性评估结论。

Based on numerical virtual flight technology, unsteady N-S equations and 6 DOF equation of motion were coupling soluted using moving chimera grid. A method was developed to estimate projectile stability, and it could consider the effect of unsteady aerodynamic characteristics. Through the numerical simulation of the slandard model for a typical external store release and the standard model of M852 bullet of BRL. The results showed that the numerical method was accurate and available, and it could be used in numerical virtual flight simulation. Finally, the virtual flight simulation of a mass simulated projectile was carried out, and the numerical result gave dispersion and flight stability assessment conclusion under different disturbances.