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Turbine Blade Film Cooling Study: The Effects of Showerhead Geometry

[+] Author Affiliations
Luzeng Zhang, Hee Koo Moon

Solar Turbines Incorporated, San Diego, CA

Paper No. GT2006-90367, pp. 353-361; 9 pages
doi:10.1115/GT2006-90367
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

To optimize turbine blade showerhead film cooling, detailed film effectiveness was measured for four different showerhead geometries in a warm cascade simulating realistic engine operation conditions. Local film effectiveness distributions were obtained on both the pressure and suction surfaces of blade models using the pressure sensitive paint (PSP) technique. The four different geometries that have been investigated include: baseline geometry with a three-row showerhead; reduced injection angle geometry; a two-row geometry and increased diameter geometry. Nitrogen gas was used to simulate cooling flow as well as a tracer gas to indicate oxygen concentration such that film effectiveness by the mass transfer analogy could be obtained. Cooling mass flow was controlled to have a coherent comparison between the different geometries. Local film effectiveness distributions were measured for each of the cooling mass flows. Then the distributions were spanwise averaged for comparison. Reducing the injection angle or increasing the hole diameter, the film effectiveness improved slightly for a fixed total coolant flow. The two-row injection resulted in poor film effectiveness distribution possibly due to jet lift-off as it had higher momentum compared to the three-row injection.

Copyright © 2006 by ASME

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