Influence of clearance model on numerical simulation of centrifugal pump

[摘要] Computing models are always simplified to save the computing resources and time. Particularly, the clearance that between impeller and pump casing is always ignored. But the completer model is, the more precise result of numerical simulation is in theory. This paper study the influence of clearance model on numerical simulation of centrifugal pump. We present such influence via comparing performance, flow characteristic and pressure pulsation of two cases that the one of two cases is the model pump with clearance and the other is not. And the results show that the head decreases and power increases so that efficiency decreases after computing with front and back cavities. Then no-leakage model would improve absolute velocity magnitude in order to reach the rated flow rate. Finally, more disturbance induced by front cavity flow and wear-ring flow would change the pressure pulsation of impeller and volute. The performance of clearance flow is important for the whole pump in performance, flow characteristic, pressure pulsation and other respects.

[发布机构] Jiangsu University, Zhenjiang, Jiangsu, China^1

[效力级别] 工业技术 [学科分类] 工业工程学

[关键词] Absolute velocities;Back cavities;Computing model;Computing resource;Flow charac-teristics;No leakages;Power increase;Pressure pulsation