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| DOI：10.13522/j.cnki.ggps.2022386 |
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| Experimental Study and Optimization of the Impeller in High-speed Centrifugal Pump |
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WANG Yanwei, REN Yancong, LI Yufang
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Key Laboratory of Chemical Equipment Enhancement and Intrinsic Safety, Wuhan Institute of Technology, Wuhan 430205, China
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| Abstract: |
| 【Background and Objective】Fatigue fracture has become a major cause of failure in centrifugal pump impellers due to their operation at high speeds. Excessive speed leads to various prestresses, resulting in severe vibrations, resonance, and ultimately fatigue fracture of the impeller. This study aims to investigate the influence of different curvature radii of the front and rear covers on the natural frequency of high-speed centrifugal pump impellers. The findings provide a scientific basis for the optimal design of the impellers.【Method】The numerical simulation method is employed to determine the natural frequencies of the first six orders of the impeller. Modal analysis is then performed on impellers with varying curvature radii of the front and rear cover plates. A comparison chart of the modal frequencies of the first six orders is generated.【Result】The natural frequency of the impeller increases with an increase in the radius of curvature of the front cover. Specifically, when the radius increases from 10 mm to 14 mm, the natural frequency of the fourth order experiences the most significant change, increasing by 10%. On the other hand, increasing the radius of curvature of the rear cover has minimal effect on the impeller’s natural frequency, with a decrease of only 0.18% observed when the radius increases from 20 mm to 30 mm.【Conclusion】Increasing the radius of curvature of the front cover of the impeller can effectively raise the modal frequency of the centrifugal pump impeller and improve its dynamic characteristics. |
| Key words: centrifugal pump; impeller; vibration characteristics; numerical simulations; modal analysis |
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