Large Eddy Simulation of a realistic film cooling configuration is performed, consisting of a large plenum feeding a periodic array of short film cooling holes with length to diameter ratio L/d = 3.5. Film cooling jets are issued at 35 degrees into the turbulent crossflow boundary layer above the flat surface. Time-averaged flowfield is analyzed to reveal steady and unsteady structures occurring as a result of plenum-jet-crossflow interactions. Among these structures are the flow separation inside the film-hole, reverse flow zone right behind the jet injection and the counter-rotating vortex pair in the wake of the jet. All of these structures influence the wall temperature distribution and have a negative effect on film cooling effectiveness.

Volume Subject Area:
Symposium on Advances in Numerical Modeling of Aerodynamics and Hydrodynamics in Turbomachinery
Topics:
Film cooling, Flat plates, Flow (Dynamics), Large eddy simulation, Boundary layers, Flow separation, Jets, Turbulence, Vortices, Wakes, Wall temperature
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Copyright © 2006
 by ASME
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