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Structure of the Rotor Tip Flow in a Highly-Loaded Single-Stage Axial-Flow Pump Approaching Stall: Part I — Breakdown of the Tip-Clearance Vortex

[+] Author Affiliations
H. Schrapp, U. Stark, I. Goltz, G. Kosyna

Technische Universität Braunschweig, Braunschweig, Germany

S. Bross

KSB AG, Frankenthal, Germany

Paper No. HT-FED2004-56780, pp. 307-312; 6 pages
doi:10.1115/HT-FED2004-56780
From:
  • ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
  • Volume 3
  • Charlotte, North Carolina, USA, July 11–15, 2004
  • Conference Sponsors: Heat Transfer Division and Fluids Engineering Division
  • ISBN: 0-7918-4692-X | eISBN: 0-7918-3740-8
  • Copyright © 2004 by ASME

abstract

Moderate cavitation was used to visualize the tip clearance vortex in a highly-loaded single-stage axial-flow pump. Two different techniques were utilized to produce photographs and videos. From these it was found that for flow rates lower than design an initially well defined clearance vortex undergoes spiral-type vortex breakdown. This result was theoretically confirmed in an approximate manner by solving the Bragg and Hawthorne equation for an isolated vortex with a measured casingwall pressure distribution as a prescribed boundary condition.

Copyright © 2004 by ASME

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