矿浆泵内转速对固液流体速度矢量分布的影响分析

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.%With the application of Euler model,RNG κ-ε (Renormalization-group κ-ε) turbulence model and SIMPLEC algorithm,the numerical analysis of solid-liquid two phase flow of impeller and diffuser in slurry pump was carried on to investigate the internal characteristics of flow field and performance on the influence of rotational speed in slurry pump for deep-sea mining.The effects of absolute velocity distribution of impeller blades and guide vanes and performance of slurry pump were researched.The results show that:when the rotational speed increases,the boundary layer separates more easily in the impeller flow region,and the flow capacity weakens;At the outlet of impeller,the stronger the jet-wake structure is,the more serious hydraulic loss is;The more violent the impact of space guide vane inlet is,the more confused the flow of the region is,and there is a large scale two flow in the inlet of the guide vane pressure.However,with the increase of the rotational speed,the flow separation of the mixed fluid at the inlet of the guide vane suction surface is suppressed,which increases the flow capacity and reduces the hydraulic loss.