An experimental and computational investigation was conducted on the film cooling adiabatic effectiveness of a flat plate with full coverage film cooling. The full coverage film cooling array was comprised of ten rows of coolant holes, arranged in a staggered pattern, with short normal coolant holes. A single row of cooland holes was also examined to determine the accuracy of a superposition prediction of the full coverage adiabatic effectiveness performance. Large density coolant jets and high mainstream turbulence conditions were utilized to simulate realistic engine conditions. High-resolution adiabatic effectiveness measurements were obtained using infrared imaging techniques and a large-scale flat plate model. Optimum adiabatic effectiveness was found to occur for a blowing ratio of At this blowing ratio separation of the coolant jet immediately downstream of the hole was observed. For the high mainstream turbulence decreased the spatially averaged effectiveness level by 12 percent. The high mainstream turbulence produced a larger effect for lower blowing ratios. The superposition model based on single row effectiveness results over-predicted the full coverage effectiveness levels.
Full-Coverage Film Cooling With Short Normal Injection Holes
Contributed by the International Gas Turbine Institute and presented at the 46th International Gas Turbine and Aeroengine Congress and Exhibition, New Orleans, Louisiana, June 4–7, 2001. Manuscript received by the International Gas Turbine Institute February 2001. Paper No. 2001-GT-130. Review Chair: R. Natole.
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Harrington, M. K., McWaters, M. A., Bogard, D. G., Lemmon, C. A., and Thole, K. A. (February 1, 2001). "Full-Coverage Film Cooling With Short Normal Injection Holes ." ASME. J. Turbomach. October 2001; 123(4): 798–805. https://doi.org/10.1115/1.1400111
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