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| Effect of blade slotting on radial thrust of single vane centrifugal pump |
| SHI Weidong1, 2*, LI Linjian1, XU Rongjun3, WANG Bin4, TAN Linwei2, ZHOU Ling1 |
| 1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. School of Mechanical Engineering, Nantong University, Nantong, Jiangsu 226000, China; 3. Lanshen Group Co. Ltd., Nanjing, Jiangsu 211500, China; 4. Anhui Fulotai Pump System Co. Ltd., Ningguo, Anhui 242300, China |
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Abstract In order to improve the operating characteristics of single vane centrifugal pumps and reduce the radial thrust, the dynamic characteristics of the thrust in a single vane centrifugal pump was analyzed by using a combination method of numerical simulation and experiment. The variation rules of radial thrust were clarified under three flow rate conditions, such as 0.6Qd, 1.0Qd and 1.4Qd. The results show that the static pressure difference across the blade pressure and suction sides mainly attribute to the radial thrust, which achieves the maximum value at a low flow rate. A new method—blade slotting for relieving the radial thrust in the pump was proposed by analyzing and comparing both the experimental and numerical results. Then, one 1.0 mm wide slot was made across the blade at three different circumferential positions selected such as 0°, 90° and 270°, respectively. The influences of the slot position on the radial thrust and pump performance were analyzed. The results show that when the slot is located near blade trailing edge the pump performance is less affected but the pressure difference across the blade pressure and suction sides is reduced greatly, and the radial thrust on the impeller is declined. Consequently, the reliability of single vane centrifugal pump will be improved, and its service life will be extended.
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Received: 05 March 2019
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