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Investigation on the Influence of Surface Roughness on the Moment Coefficient in a Rotor-Stator Cavity With Centripetal Through-Flow

[+] Author Affiliations
Bo Hu, Dieter Brillert, Hans Josef Dohmen, Friedrich-Karl Benra

University of Duisburg-Essen, Duisburg, Germany

Paper No. FEDSM2017-69018, pp. V01AT03A001; 9 pages
doi:10.1115/FEDSM2017-69018
From:
  • ASME 2017 Fluids Engineering Division Summer Meeting
  • Volume 1A, Symposia: Keynotes; Advances in Numerical Modeling for Turbomachinery Flow Optimization; Fluid Machinery; Industrial and Environmental Applications of Fluid Mechanics; Pumping Machinery
  • Waikoloa, Hawaii, USA, July 30–August 3, 2017
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-5804-2
  • Copyright © 2017 by ASME

abstract

In radial pumps and turbines, the leakage flow (centripetal through-flow) is quite common from the outer radius of the impeller to the impeller eye, which has major impact on frictional torque. There is still an uncertainty on the impact of surface roughness on the moment coefficient. Part of the 2D Daily&Nece diagram where the flow is categorized into four regimes is extended into 3D with the third axis of through-flow coefficient by distinguishing the profiles of tangential velocity. After classifying the flow regimes with respect to the centripetal through-flow, two correlations are developed to predict the impact of the axial gap, the global Reynolds number, the through-flow coefficient and the surface roughness on the moment coefficient according to the experimental results for both regime III and regime IV. Using the proposed equations for the moment coefficient, the influence of the centripetal through-flow and surface roughness can be better considered when designing radial pumps and turbines.

Copyright © 2017 by ASME

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