液体火箭发动机推力室热力参数的数值仿真

NUMERICAL SIMULATION ON PARAMENTERS OF LIQUID ROCKET ENGINE CHAMBER

用液体火箭发动机推力室工作过程的一组非线性方程，以混合比、燃烧室压力和出口压力三个参数作为正态随机变量，来反映推力室的内外干扰因素的影响，用 Ｍｏｎｔｅｒ－ Ｃａｒｌｏ（ Ｍ － Ｃ）方法对某型号液体火箭发动机推力室干扰因素进行了数值仿真，从而得到了推力室热力和性能参数的经验分布曲线、统计均值及在一定置信度下的置信区间。仿真结果表明，利用 Ｍ － Ｃ 方法对推力室进行数值仿真是完全可行的，所用的非线性模型是足够准确的。

In this paper, three parameters (mixture ratio, chamber pressure and outlet pressure) are regarded as normal variables to reflect the interferential effects. Using a non linear model, the engine chamber performances are simulated by Monte-Carlo method. The empirical distribution curve, statistical average value and confidence interval are obtained. The simulation result indicates that the simulation of the engine chamber performances by using Monte-Carlo method is feasible and that the non linear model is accurate enough.