Three-dimensional velocity measurements of film cooling flow under favorable pressure gradient

Filippo Coletti, Christopher J. Elkins, John K. Eaton

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

This paper addresses the effect of a favorable streamwise pressure gradient on the velocity field of a single-hole film cooling configuration, operating at unity blowing ratio. The hole is circular and inclined at 30 degrees with respect to the main flow direction. Magnetic Resonance Velocimetry is used to obtain the full threedimensional field for a baseline configuration with negligible streamwise pressure gradient and for a configuration with favorable streamwise pressure gradient. In the latter case the acceleration parameter is K=4.8·10-6, which is representative of the conditions along the pressure side of a turbine airfoil. The experiments are performed in water. The velocity and vorticity distributions highlight the strong impact of the favorable pressure gradient on the development of the counter-rotating vortex pair which dominates the dynamics of the film cooling flow. The accelerating flow drives the vortex pair towards the wall, while the increased stretching of the vortices augments their circulation. Both effects contribute to bring the counterrotating vortices closer to each other. They also persist much further in space with respect to the zero-pressuregradient case. Implications for the film cooling performance are discussed.

Original languageEnglish (US)
Title of host publicationASME Turbo Expo 2012
Subtitle of host publicationTurbine Technical Conference and Exposition, GT 2012
Pages1627-1638
Number of pages12
EditionPARTS A AND B
DOIs
StatePublished - Dec 1 2012
EventASME Turbo Expo 2012: Turbine Technical Conference and Exposition, GT 2012 - Copenhagen, Denmark
Duration: Jun 11 2012Jun 15 2012

Publication series

NameProceedings of the ASME Turbo Expo
NumberPARTS A AND B
Volume4

Other

OtherASME Turbo Expo 2012: Turbine Technical Conference and Exposition, GT 2012
CountryDenmark
CityCopenhagen
Period6/11/126/15/12

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  • Cite this

    Coletti, F., Elkins, C. J., & Eaton, J. K. (2012). Three-dimensional velocity measurements of film cooling flow under favorable pressure gradient. In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition, GT 2012 (PARTS A AND B ed., pp. 1627-1638). (Proceedings of the ASME Turbo Expo; Vol. 4, No. PARTS A AND B). https://doi.org/10.1115/GT2012-69402