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The Role of Density Ratio and Blowing Ratio on Film Cooling in a Vane Passage

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

Louisiana State University, Baton Rouge, LA

Paper No. GT2010-23680, pp. 1857-1867; 11 pages
doi:10.1115/GT2010-23680
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

Temperature and heat flux measurements have been obtained in a film-cooled, heated fixed-vane cascade. The cascade facility has the capability to deliver high-pressure air through the vane passages at high flow rates (3.5 lbm/s; 1.59 kg/s). Prior to entering the vane test section, pressurized mainstream air has been heated by a natural gas-burning combustor, which produces realistic density ratios for the film-cooling air. Measurements are reported for a vane pressure ratio of around 1.5 and for coolant blowing ratios (M) in the range of 1.0–3.0, with coolant-to-freestream density ratios (DR) in the range of 1.1–2.2. Data presented include endwall and vane surface normalized metal temperatures (NMT), and surface heat fluxes, q″ , in both local and averaged form. Generally, a higher density coolant film tends to provide greater cooling effectiveness along the endwall at higher M, with local increases in NMT of as much as 0.2, but the opposite trend is observed for lower M along the endwall, with potential lowering in NMT of 0.1 in the early-passage regions. Along the vane, a higher DR tends to produce lower NMT (peak reductions of the order of 0.1, average reductions in the range of 0.05–0.1). Higher blowing ratios (above 1.0) usually give better cooling performance due to the increased coolant flow rate.

Copyright © 2010 by ASME
Topics: Density , Cooling

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