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| Wear of large solid particles on the impeller of solid-liquid two-phase flow pump |
| SONG Longbo1, TENG Shuang2, CAO Qian2, KANG Can2*, DING Kejin3, LI Changjiang3 |
| 1. National Pump Product Quality Inspection Center(Shandong), Zibo, Shandong 255209, China; 2. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 3. The 704th Research Institute of CSIC, Shanghai 200031, China |
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Abstract In order to describe the wear of the impeller of the pump transporting the solid-liquid two-phase flow containing large solid particles, commercial computational fluid dynamics(CFD)software STAR-CCM+ was used to implement numerical simulations. The numerical scheme was validated through the experimental results obtained in a curved pipe. Effects of the concentration of the medium and solid particle diameter on performance of the pump and wear characteristics were investigated. The results show that the distribution of solid particles in the pump is uneven, and the work done by the blade working face causes the particles to hit the blade at a high speed, which is the key factor of blade wear. The wear of the impeller mainly occurs at the inlet and back of the blade, and the wear of the primary impeller is always greater than that of the secondary impeller. The increase of medium concentration will lead to the increase of impeller wear. When the particle size increases from 25 mm to 30 mm, the wear rate of the primary impeller and the secondary impeller increases sharply, and the wear of the impeller increases. When transporting small particles, the inlet angle of blade should be optimized to reduce the wear of small particles on the inlet edge of blade. When conveying large particles, the profile of blade should be optimized to reduce the wear of large particles on the back of blade.
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Received: 04 October 2020
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