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TECHNICAL PAPERS

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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References

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Patella,  R. Fortes, Reboud,  J. L., and Archer,  A., 2000, “Cavitation Mark Measurements by 3D Laser Profilometry,” Wear, 246, pp. 59–67.
Hofmann, M., Lohrberg, H., Ludwig, G., Stoffel, B., Reboud, JL., and Fortes-Patella, R., 1999, “Numerical and Experimental Investigations on the Self-Oscillating Behavior of Cloud Cavitation: Part 1 Visualisation/Part 2 Dynamic Pressures,” 3rd ASME/JSME Joint Fluids Engineering Conference, San Francisco, CA, July, ASME, New York.
Lohrberg, H., Stoffel, B., Fortes-Patella, R., Coutier-Delgosha, O., and Reboud, J. L., 2002, “Numerical and Experimental Investigations on the Cavitating Flow in a Cascade of Hydrofoils,” Exp. Fluids, accepted for publication.
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Alajbevoic, A., Grogger, H., and Philipp, H. 1999, “Calculation of Transient Cavitation in Nozzle Using the Two-Fluid Model,” 12th Annual Conf. on Liquid Atomization and Spray Systems, May 16–19, Indianapolis.
Kunz, R., Boger, D., Chyczewski, T., Stinebring, D., and Gibeling, H., 1999, “Multi-Phase CFD Analysis of Natural and Ventilated Cavitation About Submerged Bodies,” 3rd ASME/JSME Joint Fluids Engineering Conference, San Francisco, CA, ASME, New York.
Bunnell,  R. A., and Heister,  S. D., 2000, “Three-Dimensional Unsteady Simulation of Cavitating Flows in Injector Passages,” ASME J. Fluids Eng., 122, pp. 791–797.
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Kubota,  A., Kato,  H., and Yamaguchi,  H., 1992, “A New Modelling of Cavitating Flows: A Numerical Study of Unsteady Cavitation on a Hydrofoil Section,” J. Fluid Mech., 240, pp. 59–96.
Combes, J.-F., and Archer, A., 2000, “Etude de la cavitation dans la pompe SHF,” Coll. Machines Hydrauliques: Instationnarités et effets associés, Société Hydrotechnique de France, Chatou, France.
Medvitz, R. B., Kunz, R. F., Boger, D. A., Lindau, J. W., Yocum, A. M., and Pauley, L. L. 2001, “Performance Analysis of Cavitating Flow in Centrifugal Pumps Using Multiphase CFD,” ASME Fluids Engineering Division Summer Meeting, June, New Orleans, LA.
Coutier-Delgosha, O., Fortes-Patella, R., Reboud, J. L., and Hakimi, N., 2001, “Numerical Simulation of Cavitating Flow in an Inducer Geometry,” 4th European Conference on Turbomachinery, Mar. 20–23, Firenze, Italy.
Coutier-Delgosha, O., Reboud, J.L., and Fortes-Patella, R., 2001, “Numerical Study of the Effect of the Leading Edge Shape on Cavitation Around Inducer Blade Sections,” Proceedings of the 4th Int. Symp. on Cavitation, Pasadena, CA, June.
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Coutier-Delgosha, O., 2001, “Modélisation des Ecoulements Cavitants: Etude des comportements instationnaires et application tridimensionnelle aux Turbomachines,” Ph.D. thesis, INPG, Grenoble, France, Nov.
Reboud, J. L., Stutz, B., and Coutier, O., 1998: “Two-Phase Flow Structure of Cavitation: Experiment and Modelling of Unsteady Effects,” Proceedings of the 3rd Int. Symp. on Cavitation, Grenoble, France, Apr.
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Courtot, Y., Coutier-Delgosha, O., and Reboud, J.-L., 2002, “Numerical Simulation of the Unsteady Cavitation Behavior of an Inducer Blade Cascade,” AIAA J., proposed for publication.

Figures

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NPSH values for 3 percent and 10 percent head drop
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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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