Coupling optimization analysis of casing profile in suction and exhaust for liquid-ring vacuum pump

Journal of Lanzhou University of Technology ›› 2022, Vol. 48 ›› Issue (5): 35-42.

• Mechanical Engineering and Power Engineering • Previous Articles Next Articles

Coupling optimization analysis of casing profile in suction and exhaust for liquid-ring vacuum pump

ZHANG Ren-hui^1,2, LIU Gui-hong¹, WEI Xiao-xiao¹, MENG Fan-rui³

1. College of Energy and Power Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;
2. Key Laboratory of Fluid Machinery and Systems of Gansu Province, Lanzhou Univ. of Tech., Lanzhou 730050, China;
3. Zibo Water Ring Vocuum Pump Factory Co. Ltd., Zibo255200, China

Received:2021-08-07 Online:2022-10-28 Published:2022-11-21

Abstract

Abstract: The direct free-form surface deformation method was used to parameterize the whole casing profile in the suction and exhaust section of liquid-ring vacuum pump. The multi-parameter regression model of the casing profile for the inlet vacuum and efficiency was established byusing the response surface method. Multi-objective optimization of liquid-ring vacuum pump performance was carried out based on NSGA-Ⅱ algorithm, and the internal flow field and external characteristics of the optimized model and the initial model were compared and analyzed. The results show that the vacuum of the optimal vacuum model obtained by NSGA-Ⅱ multi-objective optimization is increased by 4.5%, and the efficiency of the optimal efficiency model is increased by 1.3%. All the different parts of the casing profile have a significant effect on the inlet vacuum and efficiency of the liquid-ring vacuum pump, but the influence of the casing profile in the suction section on the performance of the liquid-ring vacuum pump is obviously greater than that in the exhaust section. On the basis of traditional design, increasing the radial size of suction casing is helpful to improve the vacuum of the pump inlet. The smaller diffusion ratio of suction area and shrinkage of exhaust area would cause higher hydraulic efficiency in the pump. The casing profile with smaller radial size in the compression zone is beneficial to increase the vent pressure and reduce the back flow of the vent, thus improves the efficiency of the pump.

Key words: liquid-ring vacuum pump, casing profile, response surface method, multi-objective optimization

CLC Number:

TH36

ZHANG Ren-hui, LIU Gui-hong, WEI Xiao-xiao, MENG Fan-rui. Coupling optimization analysis of casing profile in suction and exhaust for liquid-ring vacuum pump[J]. Journal of Lanzhou University of Technology, 2022, 48(5): 35-42.

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Coupling optimization analysis of casing profile in suction and exhaust for liquid-ring vacuum pump

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