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RESEARCH PAPER

Unsteady Effects on Trailing Edge Cooling

[+] Author and Article Information
G. Medic, P. A. Durbin

Mechanical Engineering Department, Stanford University, Stanford, CA 94305-3030

J. Heat Transfer 127(4), 388-392 (Mar 30, 2005) (5 pages) doi:10.1115/1.1860565 History: Received January 21, 2003; Revised November 08, 2004; Online March 30, 2005
Copyright © 2005 by ASME
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References

Holloway, S. D., Leylek, J. H., and Buck, F. A., 2002, “Pressure-Side Bleed Film Cooling: Part I, Steady Framework for Experimental and Computational Results,” ASME Turbo Expo 2002; papers GT-2002-30471.
Iaccarino,  G., Ooi,  A., Durbin,  P. A., and Behnia,  M., 2003, “Reynolds Averaged Simulation of Unsteady Separated Flow,” Int. J. Heat Mass Transfer, 24, pp. 147–156.
Holloway, S. D., Leylek, J. H., and Buck, F. A., 2002, “Pressure-Side Bleed Film Cooling: Part 2, Unsteady Framework for Experimental and Computational Results,” ASME Turbo Expo 2002, papers GT-2002-30472.
Rigby, D. L., and Bunker, R. S., 2002, “Heat Transfer in a Complex Trailing Edge Passage for a High Pressure Turbine Blade,” NASA/CR 2002-211701.
Martini,  P., and Shultz,  A., 2004, “Experimental and Numerical Investigation of Trailing Edge Film Cooling by Circular Coolant Wall Jets Ejected From a Slot With Internal Rib Arrays,” ASME J. Turbomach., 126, pp. 229–236.
Moser,  M. M., and Rogers,  R. D., 1991, “Mixing Transition in the Cascade to Small Scales in a Plane Mixing Layer,” Phys. Fluids A, 3, pp. 1128–1134.

Figures

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The form of an energy spectrum with broadband and coherent frequencies. Units are arbitrary.
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The computational geometry
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Temperature contours in steady flow
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Temperature contours illustrating natural unsteadiness. Side view and wall temperature under natural unsteadiness.
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A sample time history and spectrum
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A sample time history and spectrum, with forcing
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Temperature contours with forced unsteadiness. Side view and wall temperature under forcing.
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Centerline adiabatic effectiveness. —, steady; ----, natural shedding; –-–, forced. ♦, experiments from Holloway et al. 1.
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Time-averaged temperature contours in a midspan plane
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Vortices with natural unsteadiness
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Vortices with forced unsteadiness. Two instants, showing the origin of subharmonics.

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