基于动态重叠网格的阀芯振荡空化的研究

Research on Cavitation of Valve Core Oscillation Based on Dynamic Overset Mesh

锥阀是压力控制阀中常用的阀结构形式,其阀芯的轴向振荡直接影响着压力控制阀的调压精度和工作稳定性。针对先导级锥阀,将动态重叠网格技术与可视化试验相结合,对锥阀振荡时启闭空化的产生原因进行了研究。结果表明:开阀时产生空化的原因是由于阀口开启时的射流;关阀时产生空化的原因是由于断流后液体惯性产生的低压压力波,且改变阀芯运动速度会对流动造成影响。

Poppet valve is a commonly used valve structure in pressure control valves,and the axial oscillation of its spool directly affects the pressure regulation accuracy and working stability of the pressure control valve.Aiming at the pilot-stage poppet valve,the dynamic overset mesh and the visual experiment are combined to study the causes of the opening and closing cavitation when poppet valve oscillates.The results show that:reason for valve opening stage cavitation is the low pressure caused by the jet flow;valve closing stage cavitation is caused by low pressure wave due to the inertial outflow of the hydraulic oil,and changing the valve core moving speed will affect the flow.