深海采矿斜流泵颗粒运动与叶片磨损

针对某型深海采矿提升斜流泵,采用k-ε湍流模型和Particle Transport Solid粒子输运模型进行了固液两相流数值模拟,对比分析了不同颗粒浓度(2%~12%)和不同颗粒粒径下(1~30 mm)的颗粒运动规律和叶片磨损情况.结果表明,随着颗粒浓度的增大,叶轮进口区域的颗粒聚集程度上升,导叶流道内的颗粒聚集程度加剧;叶轮叶片的磨损面积和导叶叶片的磨损面积逐渐增大.其中,叶轮叶片的主要磨损位置在叶片前缘,导叶叶片的主要磨损位置在叶片转向处和叶片尾缘.叶片的磨损位置都呈现从叶顶向叶根逐渐发展的趋势;导叶叶片的磨损面积比大于叶轮叶片的磨损面积比;随着颗粒粒径的增大,叶轮出口区域的聚集程度减弱,导叶流道内的颗粒聚集减轻;其磨损规律与不同浓度下的工况相一致,叶轮叶片的叶片压力面为主要磨损区域,而且导叶叶片在尾缘的磨损减小.研究结果可为深海采矿斜流泵的优化设计提供理论依据.

Particle movement and blade erosion of diagonal flow pump for deep-sea mining

The k-ε turbulence model and Particle Transport Solid particle model were used to simulate the solid-liquid two-phase flow of a diagonal flow pump for deep-sea mining. The particle movement and blade erosion under different particle concentration(2%-12%)and particle diameter(1-30 mm)were compared and analyzed. The analysis shows that with the increase of particle concentration, the agglomeration of particles in the impeller inlet and the guide vane domain increases. The erosion areas of impellers and guide vanes gradually increase. Among them, the main erosion area of impellers is leading edge, the erosion area of the guide vanes is turning area and trailing edge. Both of them show the trend from top to bottom. The erosion area of guide vanes is larger than that of impellers. With the increase of particle diameter, the agglomeration of particles in the impeller outlet domain and guide vane runner decreases. The erosion trend and area are the same as different concentration. However, the main erosion area of impellers is pressure surface. At the trailing edge of the guide vane its erosion decreases. The results can provide theory evidence for optimum design of diagonal flow pump for deep-sea mining.