多相流水击模型在泄压阀压力精度设定中的应用

Application of multi-phase water hammer model in pressure accuracy setting of pressure relief valve

为了有效地指导氮气式水击泄压阀的压力精度设定工作,提出了理论方法。该方法根据动量守恒定理与动力学理论,通过对油-气-水三相流的运动状态与泄压阀阀芯的受力进行分析,构建了油-气-水三相流水击模型和阀芯运动力学模型;设计了油-气-水三相流水击试验方案并进行了试验。结合MATLAB/Simulink仿真模拟结果与试验数据进行对比,结果表明:构建的数学模型能准确地计算出符合实际工况的水击压强、氮气压力、弹簧力的理论数值;氮气压力、弹簧力、水击压强的大小呈周期性变化,且变化周期基本同步;水击压强可进一步确定氮气压力、弹簧力的设定数值,解决了泄压阀的压力精度设定问题。

A theoretical method is proposed to effectively guide the pressure accuracy setting of the nitrogen water hammer relief valve. According to the momentum conservation theory and dynamics theory, the method is based on the analysis of the motion state of the oil-gas-water three-phase flow and the force of the pressure-relief valve spool, and the corresponding oil-gas-water three-phase flow water hammer model and the spool motion mechanics model are constructed. The oil-gas-water three-phase flow water hammer test scheme is designed and test is carried out. Comparisons are made between the simulation results by MATLAB/Simulink and the data from experiments. It is shown that the mathematical model can accurately calculate the theoretical values of the pressure of water hammer, the pressure of nitrogen and the force of spring according to actual working conditions. The values of the pressure of water hammer, the pressure of nitrogen and the force of spring change periodically, and the cycle of change is basically synchronized. The water hammer pressure can further determine the set value of the nitrogen pressure and the spring force, and solve the pressure accuracy setting problem of the pressure relief valve.