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TURBINE-09. Proceedings of International Symposium on Heat Transfer in Gas Turbine Systems
August, 9-14, 2009, Antalya, Turkey

DOI: 10.1615/ICHMT.2009.HeatTransfGasTurbSyst


ISBN Print: 978-1-56700-263-8

Investigation of Film Cooled Rough Surfaces using Large Eddy Simulation

page 13
DOI: 10.1615/ICHMT.2009.HeatTransfGasTurbSyst.550
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ABSTRACT

In the present paper the effect of roughness on the film cooling has been investigated numerically using Large Eddy Simulation (LES). A range of roughness parameters relative to the momentum thickness of the crossflow boundary layer have been studied. A roughness element model is used for representing the micro-roughness over the film-cooled surfaces. Results for different roughness parameters are analyzed and compared with the baseline smooth case. Beyond 2 hole diameters of coolant injection, roughness is shown to reduce cooling effectiveness.

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