往复式油气混输泵组合阀滞后角的研究

Research on Combination Valve Lag Angle for Reciprocating Oil-gas Multiphase Pump

针对实际组合阀的结构特点,结合相关工作参数,推导出了往复式油气混输泵组合阀滞后角的计算公式,得到了不同气液比下组合阀的滞后角。采用FLUENT软件中的VOF多相流模型及动态分层动网格模型,结合UDF将运动边界定义为活塞运动,对6组不同气液比下的组合阀滞后角进行了数值模拟,与理论计算结果比较,相当吻合。结果表明,往复泵输送油气两相介质时组合阀滞后角远远大于介质为纯液态的工况;随着介质气液比的增大,组合阀的滞后角不断增大。该研究可为往复式油气混输泵阀的设计计算提供一定的理论基础。

According to the practical structure and related working parameters of combined valve, the calculation formula of lag angle of reciprocating oil-gas multiphase pump combined valve was deduced. The lag angle for combined valve under different gas-liquid ratio was obtained. The VOF multi-phase liquid model and moveable mesh model were employed, the moving boundary was defined as piston motion by UDF, and the numerical calculation of lag angle under six different gas-liquid ratios was carried out. Furthermore, the results of theoretical calculation and numerical simulation are measured. The results show that the lag angle of combined valve is very big when the medium is gas-liquid two-phase flow, which is far bigger than the medium is pure liquid. Along with the increase of gasliquid ratio, the delay angle of combined valve increase. The study results can provide a theory basis for design of reciprocating oil-gas multiphase pump valve.