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Computations of Pulsed Film-Cooling

[+] Author Affiliations
Frank Muldoon, Sumanta Acharya

Louisiana State University, Baton Rouge, LA

Paper No. GT2007-28156, pp. 889-897; 9 pages
doi:10.1115/GT2007-28156
From:
  • ASME Turbo Expo 2007: Power for Land, Sea, and Air
  • Volume 4: Turbo Expo 2007, Parts A and B
  • Montreal, Canada, May 14–17, 2007
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4793-4 | eISBN: 0-7918-3796-3
  • Copyright © 2007 by ASME

abstract

Direct Numerical Simulation (DNS) of a pulsed film cooling jet is presented to examine if pulsations of the coolant jet can enhance film cooling effectiveness. Calculations are performed for a cylindrical jet inclined at 30-degrees. The jet pulsation is defined by the duty cycle (DC) and the Strouhal number (St), both of which are varied in the present study. Calculations are done for a baseline steady blowing ratio of 1.5. With a peak blowing ratio (M) of 1.5, pulsing with a St = 0.32 and DC = 0.5 is shown to reduce jet blow-off and improve centerline and spanwise-averaged effectiveness over the steady M = 1.5 case.

Copyright © 2007 by ASME
Topics: Cooling , Computation

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