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Heat Transfer Research
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ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v41.i7.50
pages 753-768

Investigation of Film-Cooled Rough Surfaces Using Large Eddy Simulation

Prasad Kalghatgi
Turbine Innovation and Energy Research (TIER) Center, College of Engineering, Louisiana State University Baton Rouge, LA 70803
Sumanta Acharya
Illinois Institute of Technology

RÉSUMÉ

In the present paper the effect of roughness on film cooling has been investigated numerically using Large Eddy Simulation (LES). A range of roughness parameters related to the momentum thickness of the crossflow boundary layer has been studied. A roughness element model is used for representing the microroughness 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 the cooling effectiveness.