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| Axial tip flow and performance analysis of squealer tip clearance for liquid ring pump blade |
| ZHANG Chen1*, ZHANG Renhui1, LI Rennian1, MENG Fanrui2 |
| 1. School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Zibo Water Ring Vacuum Pump Co., Ltd., Zibo, Shandong 255200, China |
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Abstract In order to improve the leakage flow structure of the axial tip clearance of the liquid ring pump and improve the hydraulic performance of the liquid ring pump, the axial squealer tip of the li-quid blade was designed. Taking the 2BEA-203 liquid ring pump as the research object, the numerical simulation method was used to analyze the leakage flow of the axial clearance of the impeller of the liquid ring pump and its interaction with the main flow. The leakage flow and performance for both the squealer tip and the flat tip were compared. The results show that the flow in the liquid ring pump presents a complex three-dimensional structure, and the squealer tip clearance can improve the efficiency and vacuum within a certain range. When the flow rate is 0.07 kg/s, the vacuum is 5.26% higher than that of flat top blade, and the vacuum and efficiency of other flow rate conditions are also slightly improved.The structure of the angular vortex near the tip of the blade pressure surface and the leakage vortex behind the blade suction surface of the blade is basically similar to that of the flat tip of the blade except the squealer vortex and squealer angular vortex in the squealer. The strength of the angular vortex near the blade pressure surface and the leakage vortex behind the blade suction surface of the axial blade tip increases gradually from the rim to the hub, and the strength of the angle vortex and the leakage vortex can be weakened to some extent by the squealer axial blade tip. In the region of gas distribution, the strength of tip leakage vortex is higher than that of liquid distribution. Due to the buf-fer effect of the squealer, the leakage velocity, turbulence intensity and total pressure loss in the clea-rance and behind the blade suction surface are reduced to a certain extent, so the suction vacuum and efficiency of the pump are improved.
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Received: 17 March 2020
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