基于正反问题迭代，提出了叶片式气液混输泵叶轮水力设计的方法。叶轮叶片的初始几何形状根据给定的速度矩分布规律进行设计，通过叶轮内CFD三维流场分析结果，改进流道参数和速度矩分布规律以优化叶片几何参数和流场分布。外特性试验结果表明，设计叶轮可在较宽的流量范围及含气量范围下工作，最优工况效率可达44.0%，且能在短时间内输送100%的气体而不发生气堵现象，证明了该设计方法的有效性和可靠性。

气液两相流的数值模拟是多相混输技术研究中的一个难点。本文假定混输泵叶轮内为泡状流动，基于宙诺时均方程和气液两相双流体模型，采用SMPLEC算法，对叶片式混输泵叶轮内部两相三维紊流流场进行了数值计算，分析了水气混合工况下的流场分布特点。对含气率GVF=15%工况下的扬程特性进行了预测并与试验结果进行对比。数值计算结果表明，混输泵叶轮流道采用较小的径向尺寸差能较好地避免离心力所引起的气液分离，防止气堵现象的发生叶轮进口部分存在的低压旋涡区容易使气体积聚，因此有必要进一步改进叶轮进口区的水力设计。

The performance characteristics of an axial-flow pump with tandem blades are studied based on the numerical computations. The arrangement of the pump impellers is established through the analysis of velocity triangles. With the commercial computational fluid dynamics (CFD) software NUMECA, the turbulent flow in the tandem axial-flow pump is simulated in various flow conditions. The detail flow structure in the leading edge region of the rear impeller is described, and the influence of the deflection angle of the rear blade on the head performance is studied. According to the simulation, the performance comparison is made between the tandem axial-flow pump and the conventional two-stage axial-flow pump with a uniform impeller size. Results of the study indicate that the tandem axial-flow pump can work in a wider range with high efficiency.

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。

基于双流体模型建立针对叶片泵内气液两相三维湍流流动的数学模型和数值计算方法。相间作用力考虑了阻力和附加质量力，湍流模型考虑了因相含量脉动引起的附加源项，在SIMPLEC算法基础上提出了一种气液两相流的压力修正算法。运用所建模型计算了叶片式气液混输泵在进口含气率分别为5%，15%，25%的系列工况下叶轮的内部两相流场，并作了扬程特性预测。与实验结果的对比表明，所提出的流动模型是可靠的，并具有较宽的进口含气率适用范围。

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。