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| Internal flow characteristics of submersible sewage pump based on specific area regulation |
| CHEN Jianhua1, ZHOU Ling1, ZHANG Fan2, FANG Xin2, LI Yibin2* |
| 1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China |
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Abstract In order to improve the hydraulic performance and operating efficiency of the pump, the good matching of geometric parameters between impeller and volute of submersible sewage pump was studied. Taking a submersible sewage pump with specific-speed ns=261 as the research object, three specific area control schemes are designed according to the different placement angles of volute tongue. The internal flow field of three schemes pump was numerically calculated by computational fluid dynamics method. The velocity distribution, static pressure distribution, turbulent kinetic energy distribution, dissipation rate distribution of turbulent kinetic energy and volute hydraulic loss under three specific area control schemes were compared and analyzed, and the correctness of numerical calculation results was verified by experiments. The results show that the change of specific area is the main factor affecting the hydraulic performance of the volute when the placement angle of the tongue changes within 5°. The value of specific area should be given priority to be near 1.0 when volute is designed. When the tongue placement angle is 42°-44° and the specific area varies in the range of 1.0-1.2, the ope-ration efficiency of the submersible sewage pump remains basically constant. The research results can provide some references for the optimal design of submersible sewage pump.
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Received: 09 March 2021
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