矿浆泵内转速对固液流体速度矢量分布的影响分析

发布时间：2018-11-03 17:31

【摘要】：为了研究转速对深海采矿矿浆泵内部流动特性及对工作性能的影响,应用欧拉模型,RNGκ-ε(Renormalization-groupκ-ε)湍流模型及SIMPLEC算法,对矿浆泵叶轮及空间导叶内固液两相流场进行数值模拟,研究叶轮叶片和导叶叶片的绝对速度分布及外特性的影响。结果表明:随着转速n的增大,叶轮流道区域内的边界层更易分离,过流能力减弱,在叶轮出口处,射流-尾迹结构越强,水力损失越严重。空间导叶流道进口处的冲击更加猛烈,此区域流动愈加混乱,在导叶压力面进口处出现了范围更大的二次流。但随着转速n的增大,混合流体在导叶吸力面进口处的流动分离被抑制了,增大了过流能力,减弱了水力损失。
[Abstract]:In order to study the effect of rotational speed on internal flow characteristics and working performance of deep sea mining slurry pump, Euler model, RNG 魏-蔚 (Renormalization-group 魏-蔚) turbulence model and SIMPLEC algorithm are used. The solid-liquid two-phase flow field in the impeller of slurry pump and the space guide impeller were numerically simulated, and the influence of the absolute velocity distribution and the external characteristics of the impeller blade and the guide vane were studied. The results show that the boundary layer in the impeller flow passage region is more easily separated with the increase of rotational speed n, and the flow passing capacity is weakened. The stronger the jet wake structure is at the outlet of the impeller, the more serious the hydraulic loss is. The impingement at the inlet of the space guide vane is more violent, the flow in this area is more chaotic, and there is a larger secondary flow at the inlet of the guide vane pressure surface. However, with the increase of rotational speed n, the flow separation of the mixed fluid at the inlet of the suction surface of the guide vane is restrained, which increases the overflow capacity and weakens the hydraulic loss.
【作者单位】：中南大学机电工程学院;中南大学高性能复杂制造国家重点实验室;
【基金】：国家自然科学基金项目(51375498) 教育部博士点基金项目(20130162110004)资助
【分类号】：TD857;TD424

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