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| Hydraulic and structural characteristics of cylindrical hub type circulating water pump |
| JIAO Haifeng1,TANG Fangping1,SHI Wei2,SHI Lijian1*,ZHANG Yunjing3 |
| 1. College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225100, China; 2. South-to-North Water Transfer Eastern Jiangsu Water Resources Co. Ltd., Nanjing, Jiangsu 210000, China; 3. Lanshen Group Co. Ltd., Nanjing, Jiangsu 210000, China |
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Abstract In order to study the hydraulic and structural performance of circulating water pump, CFD software was used to carry out numerical simulation and structural calculation of circulating water pump device. First, the hydraulic performances were compared between the circulating water pump and traditional axial-flow pump device, and then the reliability of the data was verified through model tests. The results show that the change of the hub type mainly affects the hydraulic performance of the impeller chamber but it has little effect on the vane, or the inlet and outlet water passages. Under the design condition, the circulating water pump device has a head of 3.35 m, an efficiency of 86.29% and a maximum efficiency of 86.69% while the traditional axial-flow pump device has a head of 3.19 m, an efficiency of 85.63% and a maximum efficiency of 85.74%. The difference of head between two pump devices under the design condition is about 0.16 m, and the difference in efficiency is about 0.66%. The difference of hydraulic performance is obvious. The head of circulating water pump device is higher than that of the traditional axial-flow pump device under all working conditions. The efficiency of the circulating water pump device is significantly higher than that of the axial-flow pump device at the design flow rate and large flow rate. The difference of efficiency is small at small flow rates. The maximum stress of the circulating pump impeller occurs in the area where the impeller inlet hub is connected to the impeller. The maximum displacement occurs in the area where the inlet vane is near the rim. As the flow rate increases, the maximum stress and maximum displacement of the blade gradually decrease. The research results provide a reference for the design and development of the impeller of axial-flow pump.
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Received: 25 August 2019
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