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Film Cooling Performance of Sharp-Edged Diffuser Holes With Lateral Inclination

[+] Author Affiliations
Christian Heneka, Achmed Schulz, Hans-Jörg Bauer

Karlsruhe Institute of Technology, Karlsruhe, Germany

Andreas Heselhaus, Michael E. Crawford

Siemens Power Generation, Mülheim/Ruhr, Germany

Paper No. GT2010-23090, pp. 1719-1728; 10 pages
doi:10.1115/GT2010-23090
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 4: Heat Transfer, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4399-4 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

An experimental study on film cooling performance of laterally inclined diffuser shaped cooling holes is presented. The measurements have been conducted on a flat plate with coolant ejected from a plenum. The film cooling effectiveness downstream of a row of four laidback fanshaped holes with sharp-edged diffusers has been determined by means of IR thermography. A variety of geometric parameters has been tested, including the inclination angle, the compound angle, the area ratio, and the pitch to diameter ratio. All tests have been performed over a wide range of engine typical blowing ratios (M = 0.5–3.0). The hot gas Reynolds number and the coolant to hot gas density ratio have been kept constant close to engine realistic conditions. The results, presented in terms of contour plots of related adiabatic film cooling effectiveness as well as laterally averaged related values, clearly show the influences of the cooling hole geometry. Increasing the area ratio and the compound angle, in general, leads to higher values of the effectiveness, whereas steeper injection causes a reduction of the effectiveness.

Copyright © 2010 by ASME
Topics: Cooling , Diffusers

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