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| Effect of annular jetting hole specific area on performance of vertical self-priming pump |
| CHENG Xiaorui1,2, XIONG Bo1*, LIU Mingjian1, WANG Juanjuan1 |
| 1. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.Key Laboratory of Fluid Machinery and Systems of Gansu Province, Lanzhou, Gansu 730050, China |
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Abstract To study the influence of annular drainage injection jet on performance of vertical self-priming pump, the vertical self-priming pump 350WFB-1200-50 was used as the research object, and the full flow field of vertical self-priming pump under different annular jetting hole specific areas was calculated using RNG k-ε turbulence model and the Zwart cavitation model. The research results show that the impeller inlet pressure and the cavitation performance of pump can be significantly improved by annular drainage injection jet. However, the NPSHR is increased resulted from an increase of impeller inlet speed which cased by the drainage flow, then the cavitation performance of pump deteriorated. Finally, the cavitation performance of pump increases first and then worse under the combined action of the two. As the specific area k of annular jetting hole increases, the volume loss of pump is increased resulted from an increase of leakage at the outlet of volute more vortexes at the outlet of volute and the impeller inlet streamline is crowded resulted from the jetting flow, which has a great influence on the mainstream, then the head and efficiency of pump declined. The vertical self-primimg pump net positive suction head reaches the minimum when the specific area k of annular jetting hole is 0.25, compared with the original model, the vertical self-primimg pump net positive suction head is reduced by 23%, the head is reduced by 2.1% and the efficiency is reduced by 2.5%. The research results can provide some reference for the optimization design of vertical self-priming pump.
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Received: 19 May 2021
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