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为提高多级离心泵的水力效率,借助于FLUENT软件,对多级泵叶轮和径向导叶不同组合、不同工况下的内外水力性能进行了研究.结果表明:叶片进口边扭曲度高的叶轮具有较高的效率;泵的效率和扬程随导叶和叶轮配合间隙的增大而降低;在变流量工作时,叶轮与导叶水力性能的最优匹配关系可能随流量的变化而发生改变;转速对叶轮和导叶匹配性能影响极小.叶轮和导叶内部流场分析表明:叶轮和导叶内部的涡流是降低泵水力效率的主要因素,提出适当增加叶片进口扭曲度、减小叶轮和导叶间隙,从而减弱内部旋涡是多级离心泵水力性能优化的方向之一.由试验结果可见:多级泵外特性的模拟结果与试验结果误差在10%以内.
In order to improve the hydraulic efficiency of multi-stage centrifugal pump, the hydraulic performance of different conditions of multi-stage pump impeller and radial guide vane with different conditions was studied by means of FLUENT software.The results showed that the impeller with high twist The efficiency and lift of the pump decrease with the increase of the clearance between guide vane and impeller. The optimal matching relationship between the impeller and guide vane hydraulic performance may change with the flow rate during variable flow operation. The rotational speed has little effect on the matching performance of the impeller and the guide vane.It is found that the vortex flow in the impeller and guide vane is the main factor to reduce the hydraulic efficiency of the pump, The guide vane clearance and the weakening of the internal vortices are therefore one of the most important aspects for the optimization of the hydraulic performance of multistage centrifugal pumps. From the test results it can be seen that the simulation results of the multistage pump external characteristics are within 10% of the experimental results.