Experimental and Numerical Studies in a Centrifugal Pump With Two-Dimensional Curved Blades in Cavitating Condition

[+] Author and Article Information
O. Coutier-Delgosha, R. Fortes-Patella, J. L. Reboud

Laboratoire des Ecoulements, Géophysiques et Industriels, B. P. 53, Grenoble, 38041, France

M. Hofmann, B. Stoffel

Laboratory for Turbomachinery and Fluid Power, Darmstadt University of Technology, Darmstadt D-64289, Germany

J. Fluids Eng 125(6), 970-978 (Jan 12, 2004) (9 pages) doi:10.1115/1.1596238 History: Received June 26, 2002; Revised October 24, 2002; Online January 12, 2004
Copyright © 2003 by ASME
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(a) Impeller geometry, (b) housing
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Unsteady-state of blade cavitation on suction side, NPSH=8 m, stroboscopic light illumination (a scaling bar is added to each image, representing a length of 10 mm)
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Unsteady-state of blade cavitation on pressure side at two different time and NPSH=7 m (laser light sheet)
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Mean vapor distribution and standard deviation on pressure side, Qn, NPSH=7 m
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Mean vapor distribution and standard deviation on pressure side, Qn, NPSH=6 m
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The barotropic state law ρ(P) for water
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Mesh of the leading edge with (a) a H-I type mesh, (b) a H-O type mesh
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Mesh applied for the calculations (300,000 cells). (a) Meridional view, (b) three-dimensional view of a blade-to-blade channel, (c) view of the mesh on hub side of the pump. (The entire pump geometry is reconstructed by rotation of the single blade-to-blade channel.)
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(a) Total pressure elevation in the pump (nominal flow rate), (b) characteristics H(Q) of the pump in noncavitating conditions
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Head drop chart at nominal flow rate. The points indicate the cavitating conditions visualized on Figs. 13 and 14. The line corresponds to the apparition of vapor.
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Development of the two-phase areas as NPSH decreases (corresponding to points on Fig. 12)
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Void ratio evolution on a blade-to-blade surface close to the shroud, and velocity fields (corresponding to the NPSH decrease represented on Fig. 12)
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Vapor structures on suction side (experiment NPSH=8 m, computation NPSH=7 m). Calculation: iso-density contour (ρ≈0.95ρ1: void ratio >5 percent) drawn in yellow, shroud in blue, blade in gray.
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(a) Numerical void ratio distribution, (b) pressure side cavity, comparison with experiment (NPSH=7 m)
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Head-drop curves in cavitating conditions: comparison at 0.8 Qn, Qn, and 1.08 Qn.
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NPSH values for 3 percent and 10 percent head drop




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