As the key equipment in the gas-liquid multiphase mixed transportation technique, the multiphase rotodynamic pump has been the focus of people’s concern. But the design of such a pump is formidable and challenging because it should simultaneously have the characteristics of a pump and a compressor. In this paper, based on the Navier-Stokes equations and the k–ε turbulent model, the 3-D turbulent flow in a multiphase rotodynamic pump impeller has been simulated numerically by using the SIMPLEC algorithm in body-fitted coordinates with the staggered grid system. The results show that the vortex region mainly exists near the tip of the impeller and the centrifugal force is an important factor to affect the formation of vortex flow that will lead to the hydraulic loss and efficiency decrease.

串列式轴流泵在现代两栖装甲车辆喷水推进领域有着潜在的应用。作者对不同比转速的两个轴流叶轮进行串联配置组成串列叶轮，应用NUMECA商业软件通过全流道的三维数值计算模拟了串列式轴流泵的内部流动结构，根据计算结果预测了其能量特性并与常规双级轴流泵进行对比。结果表明，前后级叶轮的相对位置和相互作用对串列式轴流泵的流场结构及能量特性有着重要的影响；相对常规双级轴流泵，串列式轴流泵的高效区向大流量偏离，且更加宽广，而轴功率随流量的变化保持相对稳定。

叶片式气液多相混输泵应同时兼备泵与压缩机两种流体机械的性能，因此在设计上有相当的难度，探索性很强。目前国内关于该领域的研究才处于刚刚起步的阶段。本文报导了清华大学近年在叶片式气液混输泵方面的相关试验研究成果。结果表明，目前的研发成果可以满足一定气体含量的气液混输要求。

A combined approach of inverse method and direct flow analysis is presented for the hydrodynamic design of gas-liquid two-phase flow rotodynamic pump impeller. The geometry of impeller blades is designed for a specified velocity torque distribution by treating the two-phase mixture as a homogeneous fluid under the design condition. The three-dimensional flow in the designed impeller is verified by direct turbulent flow analysis, and the design specification is further modified to optimize the flow distribution. A helical axial pump of high specific speed has been developed. To obtain a favorable pressure distribution the impeller blade was back-loaded at the hub side compared to the tip side. Experimental results demonstrate that the designed pump works in a wide flow rate range until the gas volume fraction increases to over 50% and its optimum hydraulic efficiency reaches to 44.0% when the gas volume fraction of two-phase flow is about 15.6%. The validity of design computation has been proved.

采用CFD数值模拟的方法对斜流泵级内部三维紊流流场进行计算，预测了其效率-流量、扬程-流量特性，并与实验结果进行了对比验证。根据得到的流场结果，通过斜流泵级水力尺寸改进-数值模拟分析的循环工作，在最终改进的斜流泵级预测流场中减少了泵内流场的漩涡运动，避免了出口回流的产生，削弱了叶顶间隙泄漏涡，提高了斜流泵级的效率，改进了能量特性，得到了斜流泵级改进前后流场与效率的对比。