%A ZHANG De-Sheng, SHI Wei-Dong, WANG Chuan, WANG Guo-Tao, ZOU Ping-Ping %T Influence of impeller and guide vane blade number on pressure fluctuation in mixedª²flow pump %0 Journal Article %D 2012 %J Journal of Drainage and Irrigation Machinery Engin %R 10.3969/j.issn.1674-8530.2012.02.009 %P 167-170 %V 30 %N 2 %U {http://zzs.ujs.edu.cn/pgjx/CN/abstract/article_11.shtml} %8 2012-03-30 %X To investigate into the pressure fluctuation feature caused from the rotorª²stator interaction between the impeller and the diffuser in a mixedª²flow 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 timeª²domain. 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 flucª²tuation 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 mixedª²flow pumps and their stable operations.