动态网格在固体火箭发动机内流场计算中的应用研究

The Study of Dynamic Grids Application to Calculate the Inner Flow Field of Solid Rocket Motor

固体火箭发动机在工作过程中内流场结构随燃面的减退不断发生变化,利用通常的稳态网格难以对该问题进行准确模拟。针对此问题,首先介绍了实现动态网格的基本方法,然后采用动态层方法生成动态网格对某固体火箭发动机内流场进行了计算。计算结果与实验数据的对比说明使用动态网格方法计算的准确性和可行性,与准稳态方法计算结果的比较说明在时间步长较大以及流场参数变化剧烈的情况下,动态网格方法更适用于火箭发动机内流场的计算。

The inner flow field structure of solid rocket motor changes with the grain regresses. It is difficult to simulate such problem by the conventional steady grids. To solve this problem, the basic methods of generating dynamic grids were introduced firstly, then the dynamic layering method was used to generate the dynamic grids, with which the inner flow field of solid rocket motor was calculated. The comparison between the results of calculation and experimental data shows the accuracy and feasibility with dynamic grids. The comparison with the calculated results of quasi-steady method shows that dynamic grids are more suitable for calculating the inner flow field of solid rocket motor under the condition of larger time step and strong variation of the flow field parameters.