叶片开槽对轴流泵空化性能的影响

为探究开槽叶片对轴流泵空化性能的影响，以350ZQ-70-H型潜水轴流泵为研究对象，对其不同空化余量下的流场进行定常和非定常数值模拟，对比分析原模型与改进后模型的速度矢量分布、压力分布、内部空泡体积分数及空泡体积变化等.结果表明：开槽叶片可以改善轴流泵的效率和扬程，提升轴流泵性能；开槽叶片增大了叶片进口处流动面积，降低了叶片进口处流速，使得轴流泵叶轮内压力的分布得到改善，从而对空化产生抑制作用；在空化的各个阶段里，开槽模型的空泡体积分数分布均有所降低，其中空化初始阶段最为明显，相比原模型下降了30.4%,有效抑制了空化的发展，空化性能明显提升.

Effect of slotted blade on cavitation performance of axial flow pump

In order to investigate the effect of the slotted blade on the cavitation control of the axial flow pump, the 350ZQ-70-H submersible axial flow pump is taken as the research object, and the flow field under different cavitation margins is simulated by steady and unsteady constant values. The velocity vector distribution, pressure distribution, internal void volume fraction and void volume change of the original model and the improved model are compared and analyzed. The results show that the slotted blade can improve the efficiency and head of the axial flow pump, and enhance the performance of the axial flow pump. The slotted blade increases the flow area at the blade inlet, reduces the flow velocity at the blade inlet, improves the pressure distribution in the axial flow pump impeller, and thus suppresses cavitation. In each stage of cavitation, the cavity volume fraction distribution of the slotted model is reduced, especially in the initial stage of cavitation, which is 30.4% lower than the original model, effectively inhibited the development of cavitation and significantly improved the cavitation performance.