火箭推进

气体减压阀是轨姿控发动机的关键组件,其出口压力特性直接影响到发动机系统推力性能及工作可靠性。通过减压阀低温环境影响分析,得到了影响减压阀阀芯受力和调节特性的3种因素。对3种因素影响下减压阀低温动态特性进行仿真研究,获得了低温环境减压阀启动压力峰值和稳态出口压力的相对变化趋势,减压阀启动压力峰值和稳态出口压力值均随温度的降低而升高,低温环境膜片特性的变化是影响减压阀出口压力变化的主要因素,通过减压阀低温环境起动压力峰值和稳态出口压力的拟合函数,能够预估低温启动峰值和稳态出口压力,满足发动机低温环境系统参数设计。

The gas pressure reducing valve is the key module of the orbital and attitude control engine, and its characteristic of outlet pressure directly affects the thrust performance and working reliability of the engine system.Through the influence analysis of the PRV in low temperature environment, there are three factors affecting the stress and regulation characteristics of the valve spool.The low-temperature dynamic characteristics of the PRV under the influence of three factors are simulated, and the relative change trend of the starting pressure peak and the steady-state outlet pressure of the PRV are obtained in low temperature environment.It is considered that the starting pressure peak and the steady-state outlet pressure of the valve increase with the decrease of temperature.The change of diaphragm characteristics in low temperature environment is the main factor affecting the change of outlet pressure.Through the fitting function of the starting pressure peak value and the steady-state outlet pressure of the PRV in low temperature environment, the low-temperature starting peak value and steady-state outlet pressure can be estimated to meet the requirements of the engine system parameter design in low tempserature environment.

引言
1 低温环境影响分析
2 动态仿真分析
3 特性试验
4 结论

图1 逆向卸荷式减压阀工作原理图<br/>Fig.1 Diagram of reverse unloading PRV

图1 逆向卸荷式减压阀工作原理图
Fig.1 Diagram of reverse unloading PRV

表1 不锈钢弹簧低温刚度<br/>Tab.1 Low temperature stiffness of stainless steel spring

表1 不锈钢弹簧低温刚度
Tab.1 Low temperature stiffness of stainless steel spring

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

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

图3 不同弹簧刚度条件下出口压力动态仿真曲线<br/>Fig.3 Dynamic simulation curve of outlet pressure at different stiffness of spring

图3 不同弹簧刚度条件下出口压力动态仿真曲线
Fig.3 Dynamic simulation curve of outlet pressure at different stiffness of spring

图4 不同温度下膜片应力与变形仿真结果<br/>Fig.4 Simulation results of directional deformation and equivalent stress of diaphragm at different temperatures

图4 不同温度下膜片应力与变形仿真结果
Fig.4 Simulation results of directional deformation and equivalent stress of diaphragm at different temperatures

表2 不同温度膜片刚度计算结果<br/>Tab.2 Computation results of diaphragm stiffness at different temperatures

表2 不同温度膜片刚度计算结果
Tab.2 Computation results of diaphragm stiffness at different temperatures

图5 不同膜片刚度条件下出口压力动态仿真曲线<br/>Fig.5 Dynamic simulation curve of outlet pressure at different stiffness of diaphragm

图5 不同膜片刚度条件下出口压力动态仿真曲线
Fig.5 Dynamic simulation curve of outlet pressure at different stiffness of diaphragm

表3 不同温度O形圈静摩擦力计算结果<br/>Tab.3 Calculation results of O-ring static friction at different temperatures

表3 不同温度O形圈静摩擦力计算结果
Tab.3 Calculation results of O-ring static friction at different temperatures

图6 不同温度下O形圈接触应力仿真结果<br/>Fig.6 Simulation results of contact stress of O-ring at different temperatures

图6 不同温度下O形圈接触应力仿真结果
Fig.6 Simulation results of contact stress of O-ring at different temperatures

图7 不同阻尼条件下出口压力动态仿真曲线<br/>Fig.7 Dynamic simulation curve of outlet pressure at different damping

图7 不同阻尼条件下出口压力动态仿真曲线
Fig.7 Dynamic simulation curve of outlet pressure at different damping

图8 减压阀低温试验系统<br/>Fig.8 Low temperature experiment system of PRV

图8 减压阀低温试验系统
Fig.8 Low temperature experiment system of PRV

表4 不同温度下启动压力峰值数据<br/>Tab.4 Startup pressure peak at different temperatures

表4 不同温度下启动压力峰值数据
Tab.4 Startup pressure peak at different temperatures

图9 启动压力峰值相对值随温度变化曲线<br/>Fig.9 Relative value of startup pressure at different temperatures

图9 启动压力峰值相对值随温度变化曲线
Fig.9 Relative value of startup pressure at different temperatures

表5 不同温度下出口压力数据<br/>Tab.5 Outlet pressure at different temperatures

表5 不同温度下出口压力数据
Tab.5 Outlet pressure at different temperatures

图10 出口压力相对值随温度变化曲线<br/>Fig.10 Relative value of outlet pressure at different temperatures

图10 出口压力相对值随温度变化曲线
Fig.10 Relative value of outlet pressure at different temperatures

[1] SUTTON G P.Rocket propulsion elements[Z].2016.
[2] 李晓瑾,常小庆.姿控发动机减压阀出口压力偏差计算方法研究[J].火箭推进,2008,34(6): 19-22.

备注

引言

1 低温环境影响分析

2 动态仿真分析

3 特性试验

4 结论

期刊信息