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| Analysis of flow loss characteristic of vortex pump based on entropy production |
| ZHAO Kaiyao1, LIU Houlin1*, DU Zhenming2, TAN Minggao1, HU Sheng1, DONG Liang1 |
| 1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Dalian Leo Huaneng Pump Co., Ltd., Dalian, Liaoning 116049, China |
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Abstract To research the flow energy loss during the operation of the vortex pump, the numerical si-mulations under 30%, 50% and 100% best efficiency point flow rate conditions were developed. At the same time, the flow loss of different components inside of the pump was quantitatively analyzed based on entropy production theory. The results show that the total entropy production of the vortex pump decreases first and then increases during the operation. The area with the greatest energy loss is the volute and the back cavity, which accounts for more than 70% of the total entropy production. Entropy production of impeller area gradually increases with the increase of flow rate. Under the design flow condition, the proportion of the impeller area′s entropy production to the total entropy production exceeds 20%. The entropy production in the inlet extension region decreases with the increase of flow rate, and the proportion of entropy production is less than 1% at the design flow rate and the high flow rate. Flow field analysis shows that large-scale vortices and backflow are obvious in front of volute tongue and inlet flow passage under small flow conditions. The unstable flow area under design flow and large flow conditions is mainly concentrated in the impeller area, the vortex core is almost filled with all flow paths, and a large number of vortices cause flow paths blockage and backflow.The research provides a theore-tical basis for the optimum design of vortex pump.
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Received: 05 July 2021
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