颗粒体积分数对深海采矿提升泵工作性能影响分析

摘要

In order to study how the particle volume fraction affects the lift pump work performance for deep-sea mining,the numerical analysis of a solid-liquid two-phase flow of a lift pump is carried out by using the RNG κ-ε turbulence model and Hinze-Tchen particle turbulent viscosity coefficient model.Effects of different particle volume fractions of a lift pump on the pressure and particle concentration distribution are compared.Thus effects of different particle volume fractions of a lift pump on the work performance,such as the pump head and efficiency,are studied.It provides a theoretical basis for an optimization design of the lift pump.Results are shown as follows.As particle volume fractions become bigger,the total pulp pressure in the pump decreases gradually,and then the pump head also decreases.As average particle concentrations of the blade and vane diffuser surface become bigger to some extent,probabilities of collision between particles and blades,particles and vane diffusers,and particles become larger.The flow tends to be more complex and disorderly.So the hydraulic loss increases and the efficiency of the pump decreases.The experiment proves that the numerical simulation method is feasible and accurate as the numerical simulation results are in agreement with those from the experiment.%为研究颗粒体积分数对深海采矿提升泵工作性能影响,采用RNG κ--ε湍流模型与Hinze-Tchen颗粒湍流粘性系数模型,对提升泵内固液两相流进行数值模拟,比较不同的颗粒体积分数对提升泵内压力、颗粒浓度分布的影响,进而分析颗粒体积分数对扬程、效率等工作性能的影响,为提升泵的优化设计提供理论依据.研究结果表明:随着颗粒体积分数的增加,泵内浆体总压逐渐下降,扬程随之减小,叶片与导叶表面上平均颗粒浓度均有一定幅度的上升,颗粒与叶片、导叶表面之间以及颗粒间的碰撞几率增大,流体运动趋向更加复杂,流动更加絮乱,因而加大水力损失,降低泵的效率.实验表明数值模拟与实验结果基本吻合,证实了数值模拟方法的可行性及准确性.