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Calculation of Turbulent Flows Through Linear Turbine Cascades With and Without Tip Clearance FREE

[+] Author Affiliations
Hun G. Lee, Jung Y. Yoo

Seoul National University, Seoul, Korea

Jun W. Yun

Kunsan National University, Kunsan, Cholla-bukdo, Korea

Paper No. 95-GT-128, pp. V001T01A031; 15 pages
doi:10.1115/95-GT-128
From:
  • ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 1: Turbomachinery
  • Houston, Texas, USA, June 5–8, 1995
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7878-1
  • Copyright © 1995 by ASME

abstract

Three dimensional turbulent incompressible flows through linear cascades of turbine rotor blades with high turning angles have been analyzed numerically by using a generalized k-ε model which is a high Reynolds number form and derived by RNG (renormalized group) method to account for the variation of the rate of strain. A second order upwind scheme is used to suppress numerical diffusion in approximating the convective terms. Boundary-fitted coordinates are adopted to represent the complex blade geometry accurately. For the case without tip clearance, secondary flows and flow losses are shown to be in good agreement with previous experimental results. For the case with tip clearance, the effects of the passage vortex and tip clearance flow on the total pressure loss as well as their interactions are discussed. The flow within the tip clearance has been analyzed to illustrate the existences of the tip clearance vortex and vena contracta.

Copyright © 1995 by ASME
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