基于油滴粒度测量的螺旋分离器CFD模拟与验证

CFD simulation and verification of helix separator based on oil droplet size measurement

针对一种叶片导流式螺旋分离器结构特点,设计一种模拟螺旋分离器螺旋流场中流体转速对油滴粒度分布影响的测量实验,并通过马尔文激光粒度仪实验仪器对油水混合液中的分散相粒度及其分布进行测量。研究获得油相体积分数2%情况下,各转速状态下油滴粒径典型频率分布规律,揭示了平均粒径与流体转速近似成幂指数关系。通过基于测量粒度分布开展的CFD数值模拟与实验测得的分离效率数据对比,二者基本一致,表明了该方法在特定转速下的粒度分布可有效用于开展CFD数值模拟计算。研究对于进一步开展螺旋分离器结构、操作等参数优化及油水两相流场分析等数值模拟及分析提供参考。

According to the structural characteristics of a vane guide helix separator,a measurement experiment simulating the influence of fluid speed on oil droplet particle size distribution in the helical flow field of helix separator was designed.Based on Malvern laser particle sizer,the particle size and distribution of dispersed phase in oil-water mixture were measured.The typical frequency distribution law of oil droplet size at each rotating speed under the condition of oil phase volume concentration of 2%was obtained.It is revealed that the average particle size is approximately power exponential with the fluid rotating speed.By comparing the CFD numerical simulation based on the measured particle size distribution with the experimental separation efficiency data,they are basically consistent,which shows that the particle size distribution of this method at a specific speed can be effectively used for CFD numerical simulation.The research provides a reference for further numerical simulation and analysis of spiral separator structure,operation and other parameters optimization and oil-water two-phase flow field analysis.