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Heat Transfer Coefficients of Forward and Backward Cylindrical Hole Film Cooling Using Transient IR Technique

[+] Author Affiliations
Bo Shi, Xueyang Li, Jing Ren, Hongde Jiang

Tsinghua University, Beijing, China

Paper No. GT2017-64275, pp. V05CT19A018; 9 pages
doi:10.1115/GT2017-64275
From:
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 5C: Heat Transfer
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5089-3
  • Copyright © 2017 by ASME

abstract

Film cooling has been an effective method to protect the blade from hot gas. Recent studies have demonstrated that backward injection arrangement with cylindrical hole can achieve a much more uniform cooling effects under high blowing ratios, compared to forward injection which is commonly utilized. However, there has been relatively few results of heat transfer rate distribution with backward injections. The present experiment investigates a flat plate cooled with forward and backward coolant injection. Experiments are performed in a low speed wind tunnel. The test flat plate features cylindrical holes either along stream direction or reverse of it. Transient thermal measurements are carried out for the film cooling plate with IR camera. Detailed distributions of heat transfer coefficient are obtained. A series of blowing ratios from 0.25 to 2.0 are investigated. Effects of backward injection on the surface heat transfer distributions are studied, and the results are presented and explained in this investigation.

Copyright © 2017 by ASME

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