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EDDY SIMULATION OF TURBULENT MIXING OVER TURBINE BLADE TRAILING EDGE BREAKOUT

Jongwook Joo
Department of Aerospace Engineering, Iowa State University Howe Hall, Ames, Iowa, 50011, USA

Paul A. Durbin
Department of Aerospace Engineering, Iowa State University Howe Hall, Ames, Iowa, 50011, USA

Resumo

The cause of over prediction of cooling efficiency by unsteady, Reynolds averaged simulations of turbine blade trailing edge cooling flow is investigated. It is due to deficiency in the level of unsteady, coherent energy very near to the wall. Farther from the wall, Reynolds averaged simulation produces the correct level of mixing. Eddy simulations of the instantaneous, turbulent eddying produce close agreement to data on film effectiveness. In particular, they reproduce the reduction of cooling effectiveness toward the trailing edge that has been seen in experiments. The Scale Adaptive Simulation model of Menter and Egorov (2005a) is invoked for the eddy simulations.