双流道泵内部固相颗粒分布对泵性能的影响

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基于Mixture模型，对一双流道泵内的固液两相流动进行了数值模拟，对不同颗粒直径和不同颗粒体积浓度工况下双流道泵内的固相颗粒体积浓度分布进行了研究。结果表明：在小粒径工况下，颗粒在叶轮流道内分布比较均匀，随着粒径的增大，颗粒逐渐聚集于叶轮进1：2和流道弯曲的部位，且粒径越大该处的颗粒浓度越大，固相离析作用明显；流道背面颗粒分布不均匀，其后盖板侧的颗粒浓度高于前盖板处，随着固相体积分数的增大，后盖板处聚集的颗粒也随之增多；随着粒径和颗粒体积浓度的增加泵的扬程和效率都降低。通过模拟发现，颗粒在泵内的分布受粒径的变化影响较大。

This study conducts numerical simulation on solid-liquid two-phase flow in a double channel impeller pump based on Mixture model and studies the volume concentration distribution of solid particles in double channel impeller pump under working conditions of different diameters and volume concentrations of particles. The result shows that particles are uniformly distributed in impeller passage under the working condition of small particle size; with the increase of particle size, particles gradually converge in impeller entrance and bend parts of passage; the bigger the particle size, the higher the particle concentration; solid phase segregation is obvious; particles are unevenly distributed at the back of passage; the particle concentration in back shroud is higher than that in front shroud; with the increase of solid phase volume fraction, particles gathering in back shroud increase; with the increase of particle size and volume concentration, the lift and efficiency of pump decrease. It is found through simulation that particle distribution in pump is largely affected by the change of particle size.

双流道泵，固液两相流，数值模拟，体积浓度，double channel impeller pump~ solid-liquid two-phase flow，numerical simulation，volume concentration。

双流道泵内部固相颗粒分布对泵性能的影响。