外激振动条件下气体减压器工作稳定性仿真研究

Simulation study of working stability of a gas pressure regulator under external excitation vibration conditions

为研究运载火箭增压系统中减压器在外激振动条件下的工作稳定性,在减压器模型中通过壳体位移坐标引入振动激励源,建立了可模拟减压器在外激振动条件下工作过程的计算模型,对外激随机振动条件下增压系统动态工作过程进行了仿真.针对仿真发现的减压器下游压力振荡的不稳定现象,对减压器下游不同管路尺寸和减压器不同参数下的系统工作过程进行了对比计算.计算结果显示:增大减压器下游管路尺寸,减小减压器阀芯组件质量与减小阀芯组件与壳体间滑动摩擦力,都可以使压力振荡过程减弱,有利于改善减压器在外激振动过程下的工作稳定性.计算结果为减压器及增压系统的设计和优化提供了参考.

For the purpose of studying the working stability of pressure regulator working in launch vehicle gas pressurization system under external excitation vibration conditions,the vibration exciting source was introduced through the displacement coordinate of the regulator shell to modify the pressure regulator model and the dynamic working process of a gas pressurization system was simulated under external excitation conditions.As the pressure oscillation at a presssure regulator outlet was observed,contrast calculations considering different downstream pipe sizes and different parameters of a pressure regulator were carried out.The result shows that increasing the pipe sizes,decreasing the mass of the valve spooland the friction force between the valve spool and the shell can reduce the pressure oscillation intensity and benefit the regulator’s working stability under external excitation vibration conditions.The numerical study provides a reference for the design and optimization of pressure regulators and gas pressurization systems.