运载火箭推进剂交叉输送系统控制方法仿真研究

Research on Simulation of Control Method of Propellant Cross-feed System for Launch Vehicle

利用AMESim软件建立级间多贮箱并联的交叉输送系统仿真模型,利用交叉输送地面试验数据对模型进行修正,开展了2种控制方法的仿真计算,验证了采用截止阀控制和压力差控制:2种方法的可行性。研究表明:贮箱气枕压力和交叉管路流阻是影响推进剂交叉输送的重要因素;截止阀控制方案中贮箱压力的设计需重点满足芯级发动机最低泵入口压力条件,压力差控制方案中需综合考虑满足最低泵入口压力条件和维持芯级液位稳定的要求来设计贮箱压力;截止阀控制方案所需的助推贮箱压力较小、芯级液位控制难度更小,其性能更优。

A simulation model of cross-feed system consist of several parallet tanks is developed based on AMESim,which is modified by the result of cross-feed experiment.According to the simulation result of two propellant cross-feed options,the control methods based on isolation valve and pressure difference are proved to be feasible.It is found that tank pressure and flow resistance of cross-feed line are the key factors of propellant cross-feed.In the system based on isolation valve,the tank pressure should be configured to ensure that the pump inlet pressure is greater than threshold value.However,in the system based on pressure difference,the tank pressure should also be configured to maintain the propellant level of core tank.Pressure-based scheme is better than valve-based scheme,because it needs lower.Boost tank pressure is easier to control the propellant level of core tank.