双流道泵内固液两相流动的数值模拟

Numerical simulation on solid-liquid two-phase flow in a double channel pump

采用Mixture多相流模型,对一比转速为80的双流道泵内固液两相流动进行了叶轮蜗壳耦合数值计算,比较了不同颗粒直径、不同颗粒体积浓度和不同工况等3种因素,对该双流道泵内静压分布、绝对速度分布、固相体积浓度分布以及泵能量外特性等的影响.结果表明:颗粒直径的变化对泵的固相体积浓度分布的影响最为明显,对静压分布、速度分布及泵的外特性等的影响较小;颗粒体积浓度的变化对泵内静压、固相体积浓度分布和外特性等都有比较大的影响,对速度分布没有明显影响;工况的变化对泵内静压和速度分布的影响最大,对固相体积浓度分布影响较小.本研究还表明,该固液两相流双流道泵的性能曲线趋势,与一般清水离心泵的基本相同;在输送颗粒直径为0.075 mm左右、体积浓度为30%的固液混合物时,该泵运行性能最优.

With mixture model, the solid-liquid two-phase flow in a double channel pump, with specific speed 80 was simulated. The effects of particle diameter, particle concentration and performance conditions on static pressure distribution, absolute velocity distribution, solid volume concentration distribution and energy characteristics were studied. The results indicate that the change of particle diameter has im- portant effects on solid volume concentration distribution and little impact on static pressure distribution, absolute velocity distribution, and energy characteristics. The change of particle concentration has more effects on static pressure distribution, solid volume concentration distribution and energy characteristics, but has little impact on absolute velocity distribution. The change of performance conditions has obvious effects on static pressure distribution, absolute velocity distribution, and little impact on solid volume concentration distribution. The results also show that the trend of performace curves is the same as that of water centrifugal pump and the characteristics are the best when particle diameter is 0.075 mm and the solid volume concentration is 30%.