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| Characteristics of NonSmooth Surface Drag Reduction Influence on Centrifugal Pump Impeller |
| MOU Jiegang1,DAI Dongshun1,GU Yunqing1,LIU Jian1,ZHENG Shuihua1,WANG Evan2 |
| (1. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China；
2. Institut National Polytechnique of Grenoble, Joseph Fourier University, Grenoble 38031, France) |
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Abstract Abstract： To analyze the influence of nonsmooth surface on the performance of centrifugal pump, a nonsmooth surface centrifugal pump impeller calculation model with flow drag reduction effect was established based on the characteristic of bionic pit surface drag reduction. The internal flow field of it was numerically simulated through RNG kε turbulence model, the flow regularity in nonsmooth unit cell was analyzed, and the near wall influences of nonsmooth unit cell on the velocity distribution, shear stress, internal flow field of the centrifugal pump were studied. The results show that the pit shaped nonsmooth surface can reduce the torque caused by viscous resistance by maximumly 5.8%. The nonsmooth surface well controls the near blade wall boundary layer flow and reduces the wall shear stress of the blade. The pit shaped nonsmooth surface can reduce the fluid turbulent flow in the centrifugal pump impeller, reduce the energy dissipation caused by the turbulent, make the fluid flow more stable in the impeller, and improve the efficiency of the centrifugal pump.
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Received: 14 January 2015
Published: 29 February 2016
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