弯管对双向轴流泵导叶区流动的影响

轴流泵弯管会对其上游流体产生干扰,为研究弯管和导叶的最优相对位置,以1台高比转数双向轴流泵为研究对象,分析了导叶网格转动时数值模拟结果产生变化的原因,发现导叶和叶片、导叶和弯管相对位置的变化均会影响定常数值计算结果,进而基于LES方法模拟了去除导叶和叶片流道的流场,分析了导叶和弯管相对位置变化时泵性能变化的原因,通过比较不同位置导叶区的流场进一步验证了结果,分析表明:由于弯管的影响,导叶安放位置不同时泵的性能有一定变化,导叶叶片进口冲角可能偏离设计冲角,设计时可通过延长扩散管、减小弯管角度或调整导叶布置来减小弯管对泵性能的影响.

Effect of elbow on guide vane region flow for a bidirectional axial flow pump

The elbow on an axial flow pump can cause interference to the upstream fluid of it. In order to investigate the best relative position between elbow and guide vane,a high specific speed bidirectional axial-pump was chosen as the study object to analyze the cause of numerical simulation results change, which occurred when guide vane grid rotated. It was found that the relative positions both between vane and blade and between vane and elbow can affect the steady numerical simulation results. Then the flow field of passage without guide vane and blade was simulated by the LES(Large Eddy Simulation)method, the cause of pump performance change was analyzed, and the result was verified by comparing the flow field of guide vane area at different positions. The results show that the pump performances at different positions of guide vane have a certain difference, and the inlet incidence angle of guide vane may deviate from the design angle.It can be used to reduce the influence of elbow on pump performance by extending diffusion tube, reducing elbow angle and adjusting guide vane arrangement in design.