Bang-Bang型电推进氙贮供系统两相流仿真研究与开闭周期优化

Two-Phase Flow Simulation Study and Opening/Closing Cycles Optimization of Bang-Bang-Type Electric Propulsion Xenon Storage and Supply System

关键词:  电推进  氙贮供系统  Bang-Bang阀  两相流仿真  开闭周期

Key words:  Electric propulsion  Xenon storage and supply system  Bang-Bang valve  Two-phase flow simulation  Opening/closing cycles

摘要:

针对某Bang-Bang型电推进氙贮供系统，基于Amesim仿真平台搭建起流动、传热动态数值模型进行两相流仿真研究，采用MBWR状态方程准确揭示氙工质相态变化。仿真模型与试验数据对比验证后，对Bang-Bang阀开闭周期进行参数敏感性分析来优化系统设计。结果表明：系统各工作阶段Bang-Bang阀下游缓冲罐压强以及各极流量仿真结果与试验数据或额定值误差在1.76%以内。Bang-Bang阀在异步工作周期中，中间小气容由于焦汤效应而温度瞬间下降，氙工质由气态转变为两相态并持续0.315s。采用适中的开闭周期可以在缩短缓冲罐建压响应时间的同时实现Bang-Bang阀的长寿命使用。

Abstract:

For a Bang-Bang-type electric propulsion xenon storage and supply system， a transient numerical model of flow and heat transfer is built based on the Amesim simulation platform for two-phase flow simulation study. The MBWR state equation is used to accurately reveal phase change of xenon working medium. After comparing the simulation model with the experimental data， the parametric sensitivity analysis of Bang-Bang valve opening/closing cycles is conducted to optimize the system design. The results show that the errors between simulation results and test data or rated values are less than 1.76% for the surge tank pressure of Bang-Bang valve downstream and the mass flow rate of each pole. During the asynchronous working cycle of Bang-Bang valve， the temperature of the intermediate small gas volume instantaneously declines due to the Joule-Thomson effect， and the xenon working medium changes from gaseous state into two-phase state， which lasts for 0.315s. The use of a moderate opening and closing cycle can attain a long life of the Bang-Bang valve while reducing the pressure build-up response time of surge tank.