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| Effect of circumferential setting position of diffuser in concentric volute on impeller radial thrust in centrifugal pump |
| GUO Bao, LIU Houlin, TAN Minggao, DING Rong, WANG Kai |
| National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract In order to study effect of circumferential setting position of diffuser in concentric volute on impeller radial thrust, a specific centrifugal pump with diffuser and concentric volute as well as impeller is used as the model, four design cases where the angle α between the trailing edge of the blade pressure side of the diffuser and the volute discharge nozzle wall are considered to be 0°,10°,20°and 30°, respectively. Based on ANSYS CFX, unsteady numerical simulations of the whole flow field in those cases are conducted, the predicted head and efficiency are validated with measurement. Further, the effects of α on performance and impeller radial thrust are clarified. It is identified that the maximal variations in head and efficiency are 1.95% and 1.39%, respectively, and the best pump performance is achived at α=20°. With the increase of α, the amplitude of radial thrust pulsation firstly decreases but increases eventually. At α=20°, the amplitude reaches the minimum value, which is 80% of the largest amplitude. However, the dominant frequencies of radial thrust pulsation initially increase and then decrease with the increasing α. At α=20°, the amplitudes of the first and second dominant frequencies reach the minimum values. The change of α can influence the distribution of radial thrust vector, and the distribution shows an obviously regular pattern at α=0° and 30°. Particularly, the distribution at α=0° may be more suitable. for a long-term operation of this kind of pumps.
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Received: 15 April 2015
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