考虑气固两相流的球阀冲蚀磨损失效研究

Research on Erosion and Wear Failure of Ball Valve based on COMSOL Multiphysics

针对管道气体携带杂质对球阀冲蚀磨损导致其失效的问题,采用欧拉-拉格朗日流体描述方法,运用Comsol Multiphysics软件对气固两相流球阀冲蚀磨损进行数值模拟计算,研究球阀流场特征、冲蚀磨损分布、不同参数对冲蚀磨损影响及冲蚀率随参数变化趋势,并把模拟结果与工程现场冲蚀球阀对比,验证模拟的准确性。结果表明:球阀内流速在一定范围内改变,产生的二次流漩涡是导致冲蚀的主要因素;球阀冲蚀磨损随开度减小,随流速、粒径和质量流率增大而增加,呈非线性正相关。

In view of the erosion and wear failure of the ball valve caused by the impurity carried by the pipeline gas, the Eulerian-Lagrangian fluid description method was used, and COMSOL Multiphysics software was applied to numerically simulate and calculate the erosion and wear of the gas-solid two-phase flow ball valve, and study its flow field characteristics, the distribution of erosion and wear, the influence of different parameters on erosion and wear and the variation trend of erosion rate with parameters. The simulation results are compared with the engineering site erosion ball valve to verify the accuracy of the simulation. The results show that the flow velocity in the ball valve changes within a certain range, and the secondary flow vortex is the main factor leading to erosion. Ball valve erosion and wear reduces with opening, while increases with the increase of flow velocity, particle size and mass flow rate, showing a non-linear positive correlation.