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| Effect of blade perforation near inlet edge on the cavitation performance of centrifugal pump |
| ZHAO Weiguo1,2,PAN Xuwei1,2*,SONG Qice1,2,LI Shangsheng1,2 |
| 1. School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China;2. Key Laboratory of Fluid Machinery and System, Gansu Province, Lanzhou, Gansu 730050, China |
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Abstract In order to explore the influence of the blade perforation near the inlet edge on cavitation performance of a centrifugal pump, a low specific-speed centrifugal pump was selected as the research object. Ten different sizes of pores were designed in the same place of blade inlet edge in the centrifugal pump. Based on SST k-ω turbulent model and Zwart cavitation model, under the condition of water medium, 10 different impellers were numerically simulated in the full flow passage and compared with the experimental results. The research shows that the blade perforation with the diameter of 8 mm near the inlet edge whose bubbles generates firstly improves not only head and efficiency but also cavitation performance remarkably. The blade perforation divides the general cavitation region into two in every flow passage. With the increase of pore, the low pressure area in runner reduces, then increases. The distribution of low-pressure area is the smallest when the diameter is 8 mm near the blade inlet edge. The amplitude of pressure fluctuation of perforated blade is apparently larger than that of prototype blade. With the increase of perforated position distance,the influence of perforated blade on flow field gradually decreases and disappeares completely at last in the volute.
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Received: 16 April 2017
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