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On Active Control of Film-Cooling Flows

[+] Author Affiliations
Dimitris E. Nikitopoulos, Sumanta Acharya, Jeremiah Oertling, Frank H. Muldoon

Louisiana State University, Baton Rouge, LA

Paper No. GT2006-90051, pp. 61-69; 9 pages
doi:10.1115/GT2006-90051
From:
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 3: Heat Transfer, Parts A and B
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4238-X | eISBN: 0-7918-3774-2
  • Copyright © 2006 by ASME

abstract

A technical assessment of the potential improvements resulting from the application of active control of film cooling is discussed in this paper. Two methods of film-cooling jet excitation are theoretically evaluated. Film-cooling control through pulsation of the coolant stream mass flow rate is further examined on the basis of existing experimental and preliminary computational results. A potentially optimal range of coolant pulsation parameters are identified through theoretical and mechanistic arguments based on understanding of basic physical phenomena occurring in pulsed film-cooling flow, i.e. that of a pulsed jet in cross-flow. Guidelines for the choice of potentially optimum frequency and duty cycle windows of the controlling flow pulsations are identified, as well as the related mean and peak-to-peak blowing ratios. Evidence from existing experimental data and computations are invoked to validate these guidelines. Because of the limited experimental/computational data on this subject further work is necessary in order to fully verify the aforementioned flow-pulsing parameter ranges.

Copyright © 2006 by ASME

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