深海扬矿泵内固液两相流动模型研究

Exploring Solid-liquid Two-phase Flow Model in Lift Pump for Deep-sea Mining

为选用合理的固液两相流动模型用于深海扬矿泵内矿物浆体的计算。针对深海海底矿物具有颗粒粒级跨度大且粒径大的特点,本文分别选用粗颗粒-均质浆体计算模型和固液两相混合物浆体计算模型,开展扬矿泵数值模拟分析。研究发现,粗颗粒-均质浆体计算模型计算得到的内部流场与固液两相混合物浆体计算模型得到的内部流场是相似的,所以该模型可以用来分析扬矿泵的内部流场;该模型减少了颗粒追踪数量可以节约计算时间;将两种计算方法得到的扬矿泵外特性与试验结果进行比较,发现该模型计算得到的泵扬程与功率均更接近试验结果,说明该模型在扬矿泵性能计算是有优势的。

In order to select a rational solid-liquid two-phase flow model for calculating mineral slurry in a lift pump for deep-sea mining,as the deep seabed minerals are characterized by a wide span of grain size and large particle size,the calculation models of coarse particle-homogeneous slurry and of solid-liquid two-phase mixture slurry were selected to carry out the numerical simulation analysis of the lift pump.The simulation results show that the internal flow field obtained by the calculation model of coarse particle-homogeneous slurry is similar to that obtained by the calculation model of solid-liquid two-phase mixture slurry,so the model can be used to analyze the internal flow field of the lift pump in deep-sea mining.This model can save computing time by reducing the number of particle tracking.The comparison of the external characteristics of the lift pump obtained by the two calculation models with the test results show that the pump head and power calculated with the models are in close agreement to the test results,indicating that the models have advantages in calculating the performance of the lift pump.