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Mainstream Aerodynamic Effects due to Wheelspace Coolant Injection in a High-Pressure Turbine Stage: Part I — Aerodynamic Measurements in the Stationary Frame

[+] Author Affiliations
Christopher McLean, Cengiz Camci

The Pennsylvania State University, University Park, PA

Boris Glezer

Consultant, San Diego, CA

Paper No. 2001-GT-0119, pp. V003T01A006; 12 pages
doi:10.1115/2001-GT-0119
From:
  • ASME Turbo Expo 2001: Power for Land, Sea, and Air
  • Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration
  • New Orleans, Louisiana, USA, June 4–7, 2001
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7852-1
  • Copyright © 2001 by ASME

abstract

The relative aerodynamic and performance effects associated with rotor – NGV gap coolant injections were investigated in the Axial Flow Turbine Research Facility (AFTRF) of The Pennsylvania State University. This study quantifies the effects of the coolant injection on the aerodynamic performance of the turbine for radial cooling, impingement cooling in the wheelspace cavity and root injection. Overall, it was found that even a small quantity (1%) of cooling air can have significant effects on the performance character and exit conditions of the high pressure stage. Parameters such as the total-to-total efficiency, total pressure loss coefficient, and three-dimensional velocity field show local changes in excess of 5%, 2%, and 15% respectively. It is clear that the cooling air disturbs the inlet end-wall boundary layer to the rotor and modifies secondary flow development thereby resulting in large changes in turbine exit conditions.

Copyright © 2001 by ASME

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