液氢液氧火箭发动机非线性静态特性仿真与分析

在考虑泵后推进剂温度和密度变化的情况下,建立低温液体火箭发动机非线性稳态工作的数学模型,以设计点参数为初始值采用离散牛顿法对大范围参数扰动下氢氧发动机的静态特性进行仿真,并对包括真空推力和真空比冲在内的重要参数的变化情况做相应的分析;在引入故障影响因素的情况下,针对液体火箭发动机中常见的典型故障模式进行稳态故障效应仿真和分析,为该发动机的故障检测与诊断工作奠定了基础。

Non-linear static charactersitic simulation and analysis for large LH2/LOX rocket engine

This paper established a non-linear static characteristic simulation model for low temperature rocket engine, with the consideration of propellant temperature and density variation of pump downstream. Dispersed Newton method was used to simulate static characteristic of the LH2/LOX rocket engine with a large scale disturbance introduced, also some important fault effects was simulated through introducing relevant fault factor. Then the variation of main engine parameters were analysed based on the simulation results. This work laid the foundation for fault detection and diagnoses of this engine.