Characteristics of NonSmooth Surface Drag Reduction Influence on Centrifugal Pump Impeller

Abstract

Abstract: Abstract： To analyze the influence of nonsmooth surface on the performance of centrifugal pump, a nonsmooth 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 kε turbulence model, the flow regularity in nonsmooth unit cell was analyzed, and the near wall influences of nonsmooth unit cell on the velocity distribution, shear stress, internal flow field of the centrifugal pump were studied. The results show that the pit shaped nonsmooth surface can reduce the torque caused by viscous resistance by maximumly 5.8%. The nonsmooth surface well controls the near blade wall boundary layer flow and reduces the wall shear stress of the blade. The pit shaped nonsmooth 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.

Key words: Key words： centrifugal pump, nonsmooth surface, drag reduction, boundary layer

CLC Number:

TH 311

MOU Jiegang1,DAI Dongshun1,GU Yunqing1,LIU Jian1,ZHENG Shuihua1,WANG Evan2. Characteristics of NonSmooth Surface Drag Reduction Influence on Centrifugal Pump Impeller[J]. Journal of Shanghai Jiaotong University, 2016, 50(02): 306-312.

References

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