关键词: 分布参数;推进剂输送;动力学仿真;模态分析

Abstract: The piecewise approximation state space models of laminar flow and turbulent distributed parameter liquid pipes,which take both steady state friction and frequency dependent friction into consideration,are presented respectively.The laminar flow pipes’piecewise approximation state space model is linear and the turbulent pipes’ one is nonlinear.The models including the frequency dependent friction can more precisely predict the dynamic performance of the fluid lines transients than the ones only considering the steady state friction,whereas its order increase by times.Corroboration of our models was given by simulated results of the water hammer with single pipe after valve closure and the calculated results using our models with two segments already show good agreement with those using method of characteristics

Key words: Distributed parameter;Propellant transfer;Dynamic simulation;Modal analysis