To investigate into the pressure fluctuation feature caused from the rotorstator interaction between the impeller and the diffuser in a mixedflow pump, the unsteady flow field in the pump with different numbers of blades in the impeller and the diffuser were numerically simulated based on the standard k-ε turbulence model, SIMPLEC algorithm and sliding mesh model. The pressure fluctuation data were acquired by monitoring fluid pressure at the points located at the impeller and diffuser. The influence of number of blades and blade thickness on the pressure fluctuation was discussed in timedomain. The results show that the number of impeller blades is the main factor causing pressure fluctuation in the whole flow field. The pressure fluctuation amplitudes in the inlet and outlet to the impeller is consistently increased when the number of impeller blades is reduced; while the pressure fluctuation at the impeller outlet and in the diffuser is less affected by the number of guide vanes. Those conclusions will provide a reference for hydraulic design of mixedflow pumps and their stable operations.
ZHANG De-Sheng,SHI Wei-Dong,WANG Chuan et al. Influence of impeller and guide vane blade number on pressure fluctuation in mixedflow pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(2): 167-170.
Wang Leqin, Wu Dazhuan,Zheng Shuiying, et al. Study on transient hydrodynamic performance of mixedflowpump during starting period[J]. Journal of Zhejiang University: Engineering Science, 2004,38(6):751-755. (in Chinese)
Li Zhipeng,Xie Jingbo, Yi Zhongqiang,et al. Design and experiment of a mixed pump with medium or low specific speed[J]. Transactions of the Chinese Society for Agricultural Machinery,2001,32(3):48-50. (in Chinese)
Zobeiri A, Kueny J L, Farhat M, et al. Pumpturbine rotorstator interactions in generating mode: pressure fluctuation in distributor channel［C］／／Proceedings of the 23rd IAHR Symposium on Hydraulic Machinery and Systems. Yokohama, Japan:［s.n.］,2006.
Wang Guoyu,Huo Yi,Zhang Bo,et.al. Evaluation of turbulence models for predicting the performance of an axial flow pump[J].Transactions of Beijing Institute of Technology,2009,29(4):309-313. (in Chinese)
Feng Weimin, Song Li, Zuo Lei, et al. 3D numerical simulation on unsteady turbulence flow in axial flow pump system[J].Journal of Drainage and Irrigation Machinery and Engineering,2010,28(6):531-536. (in Chinese)
Zhang Desheng, Shi Weidong, Chen Bin, et al. Unsteady flow analysis and experimental investigation of axialflow pump[J]. Journal of Hydrodynamics: Ser B, 2010,22(1):35-44.
Shi Weidong, Zhang Desheng, Guan Xingfan, et al. Numerical and experimental investigation on highefficiency axialflow pump[J]. Chinese Journal of Mechanical Engineering,2010,23(1):38-44.