火箭推进

为了解决某型姿控发动机减压阀压力振荡导致阀芯密封面损坏,进而影响调压功能的问题,对其启动过程出口压力振荡和抑制方法进行了研究。基于AMESim仿真平台建立了减压阀仿真模型,分析了阀芯行程和限流孔对减压阀启动特性的影响,结果表明:减小阀芯行程和限流孔均有利于抑制减压阀启动过程出口压力振荡。基于此优化了阀芯开度,并在入口增加限流圈,试验表明改进后的减压阀出口压力相对平稳,振荡现象得到有效抑制。

In order to prevent the damage of pressure oscillation on the sealing area of valve core, a pressure reducing valve in attitude control engine system was studied on the outlet pressure oscillation during start-up process and inhibition approaches.Based on AMESim simulation platform, a simulation model of PRV was established to analyze the influence of valve spool opening degree and orifice on the starting characteristics.The simulation results show that adding orifice and reducing spool opening degree are beneficial to suppress the pressure oscillation during start-up process.Therefore, the valve spool opening degree is optimized and the flow limiting ring is added at the inlet.The test results indicate that the outlet pressure of the improved PRV is relatively stable and the oscillation phenomenon is effectively suppressed.

引言
1 减压阀的工作原理
2 减压阀启动振荡机理分析
3 仿真结果与分析
4 试验考核
5 结论

图1 卸荷式减压阀原理图<br/>Fig.1 Schematic diagram of unloading PRV

图1 卸荷式减压阀原理图
Fig.1 Schematic diagram of unloading PRV

图2 减压阀仿真模型<br/>Fig.2 AMESim simulation model of PRV

图2 减压阀仿真模型
Fig.2 AMESim simulation model of PRV

图3 减压阀启动增压过程<br/>Fig.3 Startup and pressurization process of PRV

图3 减压阀启动增压过程
Fig.3 Startup and pressurization process of PRV

图4 安全阀阀芯开度曲线<br/>Fig.4 Valve spool opening degree of safety valve

图4 安全阀阀芯开度曲线
Fig.4 Valve spool opening degree of safety valve

图5 阀芯行程对出口压力的影响<br/>Fig.5 Influence of valve spool stroke on outlet pressure

图5 阀芯行程对出口压力的影响
Fig.5 Influence of valve spool stroke on outlet pressure

图6 限流圈直径对出口压力的影响<br/>Fig.6 Influence of orifice diameter on outlet pressure

图6 限流圈直径对出口压力的影响
Fig.6 Influence of orifice diameter on outlet pressure

图7 改进后减压阀高压冲击试验曲线<br/>Fig.7 Test curves of improved PRV under high pressure impact

图7 改进后减压阀高压冲击试验曲线
Fig.7 Test curves of improved PRV under high pressure impact

图8 整机试车减压阀出口压力曲线<br/>Fig.8 Outlet pressure of improved PRV in overall system test

图8 整机试车减压阀出口压力曲线
Fig.8 Outlet pressure of improved PRV in overall system test

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备注

引言

1 减压阀的工作原理

2 减压阀启动振荡机理分析

3 仿真结果与分析

4 试验考核

5 结论

期刊信息