双组元统一推进系统减压器稳定性仿真

针对某双组元统一推进气路系统采用的高压卸荷膜片式减压器,建立起有限体积瞬变仿真模型,并搭建起减压器特性研究系统的模块化仿真模型.针对试验过程中出现的振荡现象,借助数值手段阐明了各结构和控制参数对减压器工作稳定性的影响,得出了减弱振荡的各种措施:减小阀芯质量,增大高、低压腔体积,增大弹性元件材料的阻尼系数,减小反馈孔直径,增大膜片刚度.与试验和相关文献研究情况的对比证实了某些措施的有效性.

Numerical simulation on dynamic stability of pressure reducing regulator in integral bipropellant propulsion system

A finite volume transient model of a high pressure unloading pressure reducing regulator (PRR) with diaphragm, which is used in a integral bipropellant propulsion gas system, was established. Based on this, a modularization numerical model of a characteristic research system for PRR was established. Then aiming at the instabilities observed during testing operation, the influences of several structural and control parameter on the stability of PRR were clarified by a series of numerical simulation. Those measures which can improve the dynamic stability include:reducing the mass of valve spool, increasing the volume of high-pressure chamber or low-pressure chamber, increasing the damping coefficient of springy elements material, reducing the size of feedback orifice, increasing the stiffness of diaphragm. The comparison with the experimental and simulation results in earlier literature confirms the effectiveness and feasibility of some measures.