Optimization of the liquid-ring pump case based on DFFD method
ZHANG Renhui1,2*, LIANG Meng1, YANG Junhu1,2, LI Rennian1,2, MEGN Fanrui3
1.School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.Key Laboratory of Fluid Machinery and Systems, Gansu Province, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 3.Zibo Water Vacuum Pump Factory Co.Ltd., Zibo, Shangdong 255200
To optimize the liquid-ring pump case, the response surface method based on the direct free-form deformation(DFFD)was proposed. The case profile of liquid-ring pump was parameterized precisely using the direct free-form deformation method. The design of experiment was carried out in the control variables space. The gas-liquid flow in the liquid-ring pump was simulated by using VOF multiphase model. The optimization analysis of the pump case profile was based on the response surface method, and the response relationship between the case profile of liquid-ring pump and the corresponding inlet vacuum pressure and efficiency was established. The inlet vacuum pressure and the pump efficiency of the liquid-ring pump were optimized respectively. The calculation case shows that the pump case profile has a great effect on the hydraulic performance of the liquid-ring pump. The pump efficiency and inlet vacuum pressure can be improved within a certain range. The pump case profile with a higher area expansion ratio for the suction zone would result in the higher inlet vacuum pressure, and the pump efficiency is on the contrary. With the increase of pump inlet vacuum, the pump efficiency shows an approximately linear decreasing in the design variable space.
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