中文摘要：

针对TS65-40—250离心泵易过载和出现驼峰等问题，采用无过载设计法并添置分流叶片，重新选取叶轮设计参数，设计3种优化方案。采用Pro／E和ICEM分别对3种方案进行三维造型和结构化网格划分，网格总数为150万。利用商业软件CFX12．1对优化方案进行数值模拟，边界条件设定为速度进口、压力出口和无滑移壁面。采用标准k—s模型，预测了3种方案下的外特性，分析了不同设计方案下叶轮内的压力、流线、湍动能、速度分布。通过数值模拟，得出叶轮1的水力性能和内部流动状态均较好。利用快速成型法加工叶轮1并进行试验。试验结果表明，叶轮1扬程最高高出设计参数的15％，试验效率高于国家标准2％～6％，而且有很好的无过载性能。模拟结果和实验结果表明，采用无过载设计并添置分流叶片优化方法是可行的，这种设计方法可以为低比转速无过载离心泵优化设计提供参考。

英文摘要：

Aiming at the problems of easily overload and having humps of the TS65-40-250 centrifugal pumps. Non-overload design method and added splitter blades were adopted for parameters selection of impellers and three optimization schemes were put forward. The 3-D models and the 1.5 million structure grids were generated by Pro/E and ICEM respectively. After the boundary conditions of mass-flow rate at the inlet, pressure outlet and no-slip wall were specified and the flow model was comple- mented with the standard k-8 model in the commercial software CFX 12.1. The flow field distributions of pressure, streamlines, turbulence kinetic energy and velocity as well as hydraulic performances in three impellers are predicted throngh simulation. Im- pellerl with good hydraulic characteristics and excellent inner flow patterns were produced for experiments after prototyping rapid- ly. The test results are in accordance with the simulating results. The head of impellerl is 15% higher than the design parameter at most and the efficiencies are 2% -6% higher than the designed efficiencies. The test results also show a good non-overload performances. The results prove that it is an effective and reliable method to design a non-overload pump with low specific speed.