It is shown how natural and forced unsteadiness play a major role in turbine blade trailing edge cooling flows. Reynolds averaged simulations are presented for a surface jet in coflow, resembling the geometry of the pressure side breakout on a turbine blade. Steady computations show very effective cooling; however, when natural—or even moreso, forced—unsteadiness is allowed, the adiabatic effectiveness decreases substantially. Streamwise vortices in the mean flow are found to be the cause of the increased heat transfer.
Issue Section:
Research Paper
Topics:
Computation,
Cooling,
Flow (Dynamics),
Geometry,
Jets,
Nozzles,
Simulation,
Temperature,
Vortices,
Pressure
1.
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4.
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5.
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.Copyright © 2005
by ASME
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