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Detailed Measurements of Local Heat Transfer Coefficient in the Entrance to Normal and Inclined Film Cooling Holes FREE

[+] Author Affiliations
David R. H. Gillespie, Aaron R. Byerley, Peter T. Ireland, Zuolan Wang, Terry V. Jones

University of Oxford, Oxford, UK

S. Toby Kohler

Rolls Royce, Bristol, UK

Paper No. 94-GT-001, pp. V004T09A001; 8 pages
doi:10.1115/94-GT-001
From:
  • ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration
  • The Hague, Netherlands, June 13–16, 1994
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7886-6
  • Copyright © 1994 by ASME

abstract

The local heal transfer inside the entrance to large scale models of film cooling holes has been measured using the transient heat transfer technique. The method employs temperature sensitive liquid crystals to measure the surface temperature of large scale perspex models. Full distributions of local Nusselt number were calculated based on the cooling passage centreline gas temperature ahead of the cooling hole. The circumferentially averaged Nusselt number was also calculated based on the local mixed bulk driving gas temperature to aid interpretation of the results, and to broaden the potential application of the data. Data are presented for a single film cooling hole inclined at 90 and 150 degrees to the coolant duct wall. Both holes exhibited entry length heat transfer levels which were significantly lower than those predicted by entry length data in the presence of crossflow. The reasons for the comparative reduction are discussed in terms of the interpreted flow field.

Copyright © 1994 by ASME
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