航天器推进系统气液路故障仿真  

Numerical simulation on fault in gas and liquid lines of spacecraft propulsion system

作　　者：聂侥 程玉强[1] 吴建军[1] NIE Yao CHENG Yuqiang WU Jianjun(College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073 , China)

机构地区：[1]国防科技大学航天科学与工程学院,湖南长沙410073

出　　处：《国防科技大学学报》2017年第2期32-41,共10页Journal of National University of Defense Technology

基　　金：国家自然科学基金资助项目(51206181;51506219)

摘　　要：为了研究和分析航天器推进系统气液路故障的发展变化规律及对整个推进系统性能的影响,在某挤压式航天器推进系统仿真模型的基础上,分别采用Realizable k-ε湍流模型和一维可压缩流模型对气路泄漏和堵塞故障进行动态仿真,采用一维不可压瞬变管流模型与变流量系数模型对液路泄漏和堵塞故障进行仿真分析。仿真结果表明:推进系统增压气路堵塞和泄漏故障,会导致增压不足,使推进剂供应管路压强下降;推进剂供应管路堵塞故障和泄漏故障会导致混合比偏离设计值,使推进系统性能降低。两类故障都会引起推力不足,致使系统性能降低。两者的不同之处在于:堵塞故障下,故障组件上游压强高于额定工况,推进剂消耗低于额定工况;泄漏故障下,故障组件上游压强低于额定工况,推进剂消耗高于额定工况。In order to investigate the failure mechanism, dynamic changing law and the effect of leakage and blockage fault of spacecraft propulsion system, a dynamic simulation of some pressure-fed propulsion system was conducted based on the modular model library previously. The leakage and blockage fault of gas pressurization lines were simulated with the method of Realizable k - s model and one-dimensional compressible duct model respectively. The leakage and blockage fault simulation for propellant lines were carried out with the finite element state-variable model and variable flow coefficient model respectively. The dynamic simulation of the propulsion system was carried out and some interesting results have been obtained as follows. Firstly,due to the leakage and blockage fault of gas pressurization lines,the pressure boost couldn’t meet the need of operational state, resulting in the propellant inadequacy and pressure drop in propellant lines. Secondly, because of the leakage and blockage fault in propellant lines, the mixture radio would deviate from the designed ones, resulting in the sliding down of the propulsion system performance. Although both of the leakage and blockage fault would make the propulsion system performance slide down, there are differences between the two faults. Firstly, due to the blockage fault, the upstream pressure of faulty component is substandard and less propellant is consumed. Secondly, due to the leakage fault, the upstream pressure of leaking object is lower than normal value and too much propellant is consumed.

关 键 词：航天器推进系统 增压气路 推进剂供应管路 故障仿真 故障特性 

分 类 号：TP316[自动化与计算机技术—计算机软件与理论]