动态流量平衡阀结构优化与验证

Optimization and verification of dynamic flow balance valve structure

摘要:

针对动态流量平衡阀流量控制精度较低问题,依据孔板流量和同心环状缝隙流方程,初步设计阀芯开孔型线,提出压差补偿系数因子修正法对现有的型线公式进行了优化修正,基于大涡模拟(LES)湍流模型,数值模拟研究了优化前后动态流量平衡阀的流量控制精度和流量精度误差,对比分析阀芯开孔型线对阀内压力脉动强度的影响规律,并搭建流量测试试验台对所提优化方法进行验证。结果表明,压差补偿因子修正法优化阀芯开孔型线能有效降低阀芯端面压力脉动强度,提高动态流量平衡阀流量控制精度至3.7 %,流场模拟计算和实验结果趋势上基本吻合。

Abstract:

Aiming at the problem of low flow control accuracy of the dynamic flow balance valve, based on the orifice flow and concentric annular gap flow equations, the spool opening profile was initially designed, and the pressure difference compensation coefficient factor correction method was proposed to optimize and modify the existing profile formula. Based on the large eddy simulation (LES) turbulence model, the flow control accuracy and flow accuracy error of the dynamic flow balance valve before and after optimization were studied by numerical simulation, the influence of the valve core opening profile on the pressure pulsation intensity was compared and analyzed, and a flow test bench was built to verify the proposed optimization method. The results show that the pressure difference compensation factor correction method to optimize the spool opening profile can effectively reduce the pressure pulsation intensity of the spool end face, and improve the flow control accuracy of the dynamic flow balance valve to 3.7%. The flow field simulation calculation and the experimental results basically coincide with the trend.