摘要
对某运载火箭燃料泵后压力异常故障进行诊断分析。采用混合两相流模型、气蚀模型、多参考系模型对燃料离心泵内流场和气蚀过程进行三维数值仿真,给出了燃料泵正常、无导流套和不同尺寸多余物工况的流动特性,分析了不同工况的出口压力、流量、气蚀发生位置和空间分布。分析结果表明:燃料泵无导流套对出口压力影响较小;多余物进入诱导轮内会产生严重气蚀,同时出口压力和流量均显著下降,并随多余物尺寸增大而加剧。诊断结果对认识高速离心泵内燃料流动,分析多余物引起的故障,预测并克服气蚀发生有一定的参考价值。
The failure reason of the lower pressure of the UDMH centrifugal pump outlet for some launch vehicle was investigated in this paper.The 3Dnumerical simulation for the flow field and cavitations in the centrifugal pump was carried out by mixture model,cavitation model and multiple reference frame method.The analysis results of the flow characteristics in the normal case,non-diversion impeller case,and a set of different size remainder particles cases were given out,and the pressure,flux and cavitations region in the various cases were presented.The CFD results showed that there was little influence for the pressure of the pump outlet in the non-diversion impeller case,and the remainder particle entering the inducer would cause serious cavitations,the pressure and flux of pump outlet decreased enormously which would become intensified while the remainder particles size increasing.The fult diagnosis was very helpful for understanding propellant flow in high-speed centrifugal pumps and predicting cavitations.
出处
《上海航天》
2016年第2期68-72,共5页
Aerospace Shanghai
关键词
燃料离心泵
数值模拟
故障诊断
气蚀
多余物
Centrifugal pump
Numerical simulation
Fault diagnosis
Cavitation
Remainder particle
