液体火箭发动机气动活塞泵性能特性仿真

Simulation on the Performance Characteristics of Liquid Rocket Engine Pneumatic Piston Pump

通过对液体火箭发动机上应用的双缸双作用式气动活塞泵工作特性进行仿真研究,分析了活塞运动过程中的速度、位移与泵出口压力之间的变化规律。对活塞泵的增压特性与频率特性,以及驱动气体压力对增压特性的影响进行研究分析,表明增压比与泵出口流量成反比,而频率与流量成正比;随着驱动气体压力的提高,活塞泵输出功率呈线性增长,且活塞运动频率增大,泵出口流量随之增大,增压比减小。同时,对几种活塞泵出口压力脉动抑制方法进行仿真、比较分析,结果表明设置蓄能器是有效、简单的压力脉动抑制方案,但在设计蓄能器时,应考虑全工况下的发动机系统综合匹配性能。

A simulation study on working characteristics of the double-cylinder double-acting pneumatic piston applied to liquid rocket engines was developed. The piston moving velocity and displacement with pressure corresponding variety laws were analyzed. The pump supercharging and frequency characteristics, and actuating pressure influence on supercharging characteristics were analyzed. The results indicate inverse relationship between supercharging ratio and flow rate, and frequency in direct proportion to flow rate. With driven gas pressure increasing, pump output power linearity increased, piston moving frequency and pump output flow rate increased also, but supercharging ratio decreased. Analysis and comparison of some sort of methods to suppressing pump output pressure fluctuation indicate that setting accumulator is an available and simple method. While designing accumulator, the engine systems matching performance under all working condition must be analyzed comprehensively.