障碍物布置位置对离心泵空化性能的影响

Influence of obstacle placement on cavitation performance of centrifugal pump

为了研究离心泵叶片上的障碍物布置位置对离心泵空化性能的影响,将半球形障碍物布置在离心泵叶片工作面和背面的不同位置.选用Zwart空化模型和SST k-ω湍流模型,对不同位置布置障碍物的离心泵模型进行数值模拟,探究障碍物不同的布置位置对离心泵空化的抑制效果.结果表明,在叶片工作面进口1/3位置处布置障碍物对离心泵的空化性能提高最为明显.在叶片工作面进口1/3位置处布置半球形障碍物时,离心泵扬程升高1.14%,扬程下降3%的点迟于原始泵的程度最大;较其他位置,在该位置布置障碍物可显著降低叶轮内部的空泡体积分数,空化严重的时候效果更加明显,在空化数为0.166时,空泡体积分数较原始泵下降69.7%.所选方案能够减小叶轮进口处低压区域,使叶轮进口处不易发生空化.

In order to study the influence of the position of the obstacles on the cavitation performance of the centrifugal pump,the hemispherical obstacles were arranged at different positions of the working surface and the back surface of the blades.By using the Zwart cavitation model and the SST k-ωturbulence model,the centrifugal pump model with obstacles in different positions was simulated,and the inhibition effect of obstacles in different positions on the cavitation of the centrifugal pump was investigated.The results show that the cavitation performance of the centrifugal pump is improved most obviously when the obstacles are placed at the inlet 1/3 of the vane working face.When a hemisphe-rical obstacle is placed at the 1/3 position of the blade working face,the lift of the centrifugal pump increases by 1.14%,and the drop point of the lift by 3%is later than that of the original pump.When the cavitation number is 0.166,the cavitation volume fraction of the impeller decreases by 69.7%compared with that of the original pump.It can reduce the low-pressure area at the inlet of the impeller and make the cavitation at the inlet of the impeller less easy.