通过二次开发方法在CFX软件中引入滤波器湍流模型（FBM）。分别应用FBM模型和标准k−ε模型对Hydronautics翼形的超空化流动进行了数值模拟，并结合水洞实验结果从空泡形态和流场结构两方面对两种湍流模型的计算结果进行对比分析。结果表明，相对标准k−ε模型，FBM模型对空泡形态和空泡尺度的模拟更符合实际。FBM模型可以捕捉超空化流动中较大尺度的涡团结构，并能更清晰的模拟出空化区尾部涡团交替脱落的非定常细节。同时，FBM模型对超空化流动中反向射流现象的模拟更为敏感。

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.

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。

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。

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.