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Effect of Endwall Film Cooling Upstream of an Airfoil/Endwall Junction to Suppress the Formation of Horseshoe Vortex in a Symmetric Airfoil

[+] Author Affiliations
Kenichiro Takeishi, Yutaka Oda, Shintaro Kozono

Osaka University, Suita, Osaka, Japan

Junichi Seguchi

Matsuda Motor Co., Fuchyu, Hiroshima, Japan

Paper No. GT2013-95385, pp. V03BT13A052; 15 pages
doi:10.1115/GT2013-95385
From:
  • ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
  • Volume 3B: Heat Transfer
  • San Antonio, Texas, USA, June 3–7, 2013
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5515-7
  • Copyright © 2013 by ASME

abstract

The effects of film cooling air injection at an endwall on the endwall film cooling and the formation of a horseshoe vortex were investigated experimentally and numerically in the leading edge region of a symmetric vane. The film cooling jet was applied upstream of the airfoil/endwall junction to give counter-momentum to the horseshoe vortex, and the temperature fields and flow fields were investigated using laser-induced fluorescence (LIF) and particle image velocimetry (PIV), respectively, in comparison with a large eddy simulation (LES). A comparison of the film cooling effectiveness values found using LES showed good agreement with those found in wind tunnel tests with pressure-sensitive paint (PSP). It was found that an insufficient injection of film coolant could not suppress the formation of the horseshoe vortex, but reinforced its growth. In addition, the effect of the film coolant injection on the endwall heat transfer was examined. The results suggested that film coolant injection upstream of the leading edge has the potential to simultaneously cool the endwall and suppress the formation of the horseshoe vortex.

Copyright © 2013 by ASME

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