Study on improvement of hydraulic performance and internal flow pattern of the axial flow pump by groove flow control technology
2020
Mu, Tong | Zhang, Rui | Xu, Hui | Zheng, Yuan | Fei, Zhaodan | Li, Jinghong
When an axial flow pump operates at small flow rates, rotating stall may occur, which seriously restricts the pump performance and poses a great threat to the safe and stable operation of the whole system. The present work proposed a new groove flow control technology for the axial flow pump and studied its improvement effect and mechanism under stall conditions by numerical simulation. Results show that the groove flow control technology can significantly improve the hydraulic performance of the axial flow pump under stall conditions, with the pump head increment as high as 85.55% and the unstable region on the hydraulic performance curve was completely eliminated. In the inlet pipe region, it can effectively improve the bad flow state near the inlet of the impeller by increasing the axial velocity component and decreasing the velocity circulation dramatically. In the impeller region, the flow separation on the blade surface was improved and the cross-passage vortexes were suppressed, and the reasons were explained by analyzing the flow fields and pressure distributions in the representative grooves. In addition, compared with the diagonal groove (DG) scheme, the axial groove (AG) scheme showed better performance.
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