绞吸式开采系统提升泵固液两相流的数值分析

摘要

The paper focus on the problem that the flow field inside of the double current lift pump and the hydraulic power property have not been grasped completely,and the effectiveness is not ideal and easy to wear.Using the software of Fluent,based on the Mixture model,RNG turbulence model and SIMPLEC algorithm,the paper calculated and analyzed the field of solid-liquid phases flow in double-channel pump with different partical density and concentration.The results show that when the partical density and volume concentration are increasing,the particle distribution in impeller is transferred from the back of impeller to the work face,and the particle in the volute is being accumulated from base circle to the peripheral wall,and solid-liquid phases is increasingly segregating,and the hydraulic efficiency of pump reduced and the lift decrease.The efficiency of double channel pump takes the volume concentration of solid phase at 15% as the maximum point.When below 15%,the pump efficiency increases with the increase of volume concentration,but when more than 15%,the efficiency decreases greatly with the increase of volume concentration.%针对绞吸式开采方法水力输送系统中的双流道提升泵内部规律尚不明确,在水力输送固液两相流中容易出现使用效果不理想、易磨损的问题,应用Fluent软件,采用Mixture模型、RNG两方程湍流模型和SIMPLEC算法对提升泵在不同颗粒密度和体积分数下内部的流场进行了数值计算和对比分析,计算结果显示：随着颗粒密度和颗粒体积分数的不断增大,涡壳内的颗粒向外周壁积聚,而叶轮内颗粒由叶轮背面向叶轮工作面转移,固液两相离析加剧,泵的水力效率降低,扬程减小;同时,颗粒体积分数对泵效率的影响存在一个极大值点,体积分数低于15%时随体积分数增大而增大,增幅缓慢;当体积分数高于15%时,泵的效率随颗粒体积分数增大而降低.