Abstract: A mathematical model for the priming process of evacuated propellant feed systems was presented based on one dimensional fluid transient theory. Dissipation effects due to wall friction was accounted for by a new frequency dependent dynamic friction model. A novel approach for branching loss modeling was presented. Particularly, release and collapse of vapor bubble at the closed end of feedlines were modeled. The method of characteristics was employed for numerical analysis. Simulation results show that the model give reasonable description for water hammer and flow oscillation during priming process.

Key words: Spacecraft propulsion;Propulsion system;Propellant transfer;Feedline;Water impingement;Dynamic model

摘要： 研究了航天器推进系统管路充填过程动态模型与计算方法。以一维管道瞬变流理论为基础 ,采用瞬变管流湍流频率相关摩擦损失模型计算管壁摩擦流阻 ,构造了管路分支流阻计算模型 ,考虑了液流撞壁后的蒸汽泡团释出与崩溃现象。数值计算采用特征线方法 ,仿真结果表明计算模型较好地描述了充填过程中的水击和管流振荡现象

关键词: 航天器推进;推进系统;推进剂输送;输送管;水冲击;动态模型