Hydraulic Performance of a Mixed-Flow Pump: Unsteady Inviscid Computations and Loss Models

[+] Author and Article Information
B. P. M. van Esch

Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

N. P. Kruyt

Department of Mechanical Engineering, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands

J. Fluids Eng 123(2), 256-264 (Jan 31, 2001) (9 pages) doi:10.1115/1.1365121 History: Received June 15, 1999; Revised January 31, 2001
Copyright © 2001 by ASME
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Surface mesh for the test mixed-flow pump. The shroud of the impeller and part of the volute wall is removed to offer a better view.
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Average blade circulation Γ as a function of mesh size h. Circulation at finest mesh size h0 is Γ0.
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Experimental and computed values for the power coefficient P_, defined as P/(ρΩ3R5)
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Two-dimensional views of volute shape after boundary layer displacement correction, for three different flow rates (showing percentages of nominal flow rate)
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Boundary layer dissipation loss in impeller and volute and total loss for unsteady (u) and quasi-steady (qs) computations
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Head coefficient Ψ and efficiency η, as a function of flow rate Q; for unsteady and quasi-steady computations
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Head coefficient Ψ and efficiency η, as a function of flow rate Q. The left figure shows the influence of leakage flow and hydraulic losses on head coefficient. The right figure gives the effects of leakage flow, hydraulic losses and disc friction loss on efficiency.
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Various types of hydraulic losses and leakage loss plotted against flow rate Q. Loss is expressed in percentage of calculated shaft power Psh




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