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.
郭豹, 刘厚林, 谈明高, 丁荣, 王凯. 导叶周向安装位置对离心泵叶轮径向力的影响[J]. 排灌机械工程学报, 2016, 34(3): 204-209.
GUO Bao, LIU Houlin, TAN Minggao, DING Rong, WANG Kai. Effect of circumferential setting position of diffuser in concentric volute on impeller radial thrust in centrifugal pump. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(3): 204-209.
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