Numerical simulation of pressure fluctuation and fluid-structure interaction in a high-head double-suction pump with staggered blades
WANG Xikun1,2, ZHANG Man1*, ZHANG Desheng1
1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Maritime Research Centre, Nanyang Technological University, 50 Nanyang Avenue, Singapore
Abstract：In order to understand the effects of staggered blades on the pressure fluctuation and fluid-structure interaction of a double-suction centrifugal pump(Model DFES4-350), the original impeller and two impellers with 0° and 30° staggered blades were studied, respectively. The external characte-ristic data of the pump was obtained through test, for which ANSYS CFX was used to calculate the flow field inside of the impellers. The performance of the double suction pump was predicted. Static pressure distribution in the volute runner was obtained by unsteady calculations. ANSYS Workbench was used to calculate the fluid-structure interaction and analyze the influence of different blade configurations on the deformation and stress of the impeller. The following results are obtained that: the performance data obtained by the numerical simulation are compared with experimental data, and the error is within acceptable range, which verified the accuracy of the numerical simulation; under various working conditions, the pressure fluctuation in the volute of the original impeller and that with 0° staggered blades is relatively large, and the maximum fluctuation amplitude is 0.3 MPa. In the case of the impeller with 30° staggered blades, the pressure fluctuation in the volute is reduced to 19%-23% of that of the ori-ginal impeller, and the main frequency of fluctuation is 2 times the blade frequency transfer; For the impeller with 0° staggered blades equipped with a cover plate in the middle, part of the stress is dispersed to the cover plate, which reduces the magnitude of concentrated stress on the impeller. Meanwhile, the impeller structure is reinforced by the middle cover plate, which reduces deformation of the original impeller to a certain extent reducing; When the blades are staggered by 30°, the blades on the two sides of the cover plate are distributed asymmetrically, so that the stress is distributed to the cover plate to a greater extent and is further reduced in magnitude, at the same time, the asymmetric structure of the side blades caused the deformation of the impeller to slightly increases compared to the ori-ginal impeller.
王希坤,张曼*,张德胜. 高扬程双吸泵交错叶片的压力脉动及流固耦合数值模拟[J]. 排灌机械工程学报, 2023, 41(6): 549-555.
WANG Xikun,ZHANG Man*,ZHANG Desheng. Numerical simulation of pressure fluctuation and fluid-structure interaction in a high-head double-suction pump with staggered blades. Journal of Drainage and Irrigation Machinery Engin, 2023, 41(6): 549-555.
