Full-coverage film cooling with short normal injection holes

M. K. Harrington, M. A. McWaters, D. G. Bogard, C. A. Lemmon, K. A. Thole

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Abstract

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 L/D=1, 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 M=0.65. At this blowing ratio separation of the coolant jet immediately downstream of the hole was observed. For M =0.65, 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.

Original languageEnglish (US)
Pages (from-to)798-805
Number of pages8
JournalJournal of Turbomachinery
Volume123
Issue number4
DOIs
Publication statusPublished - Oct 1 2001

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All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

Harrington, M. K., McWaters, M. A., Bogard, D. G., Lemmon, C. A., & Thole, K. A. (2001). Full-coverage film cooling with short normal injection holes. Journal of Turbomachinery, 123(4), 798-805. https://doi.org/10.1115/1.1400111