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Temperature and Pressure Measurements in a Hot Cascade With Film Cooled Endwalls and Airfoils

[+] Author Affiliations
James W. Post, Sumanta Acharya

Louisiana State University, Baton Rouge, LA

Paper No. GT2008-51327, pp. 1127-1135; 9 pages
doi:10.1115/GT2008-51327
From:
  • ASME Turbo Expo 2008: Power for Land, Sea, and Air
  • Volume 4: Heat Transfer, Parts A and B
  • Berlin, Germany, June 9–13, 2008
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4314-7 | eISBN: 0-7918-3824-2
  • Copyright © 2008 by ASME

abstract

Measurements of endwall and vane cooling effectiveness are reported in a pressurized hot cascade consisting of a natural-gas-fired combustor and film-cooled guide-vanes and endwall. The experiments are performed for operating conditions that are more realistic than typical low-speed cascade studies. Measurements are reported for a maximum pressure ratio (Po,∞ /Ps ) of 2, combustor exit temperature of 750 °F (399 °C), blowing ratios in the range of 1–2, and coolant to freestream density ratio (DR) of around 2. Results reported include pressure ratios, surface temperature ratios and cooling effectiveness along the endwall and airfoil surfaces. Cooling effectiveness (non-dimensional surface temperature) values in the range of 0.2–0.3 are generally observed along the endwall with poorer coverage in the vicinity of the suction surface.

Copyright © 2008 by ASME

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