Published 18 issues per year
ISSN Print: 1064-2285
ISSN Online: 2162-6561
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EFFECT OF ANTI-VORTEX HOLE ANGLE ON THE FILM COOLING EFFECTIVENESS
ABSTRACT
The effects of the anti-vortex hole angle and blowing ratio on the flat plate film cooling effectiveness were investigated experimentally. To measure the cooling effectiveness of the film, a pressure sensitive paint technique was applied. The experiments were conducted for cylindrical and anti-vortex film cooling holes, and three blowing ratios: 0.25, 0.5, and 1.0. The coolant to mainstream density ratio was 1, and two anti-vortex hole angles − 0° and 15° − with respect to the flow direction were considered. For the cylindrical hole case, the film cooling effectiveness decreased with the rising blowing ratio because of the coolant lift-off. For the 15° anti-vortex hole case, however, a higher blowing ratio resulted in greater film cooling effectiveness due to the reduced actual blowing ratio and diminished kidney vortex. For all blowing ratios, the 15° anti-vortex hole case showed a higher film cooling effectiveness than the 0° anti-vortex hole or the cylindrical hole case.
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Choi Jung Uk, Kim Gi Mun, Lee Hyun Cheol, Kwak Jae Su, Optimization of the Coanda bump to improve the film cooling effectiveness of an inclined slot, International Journal of Thermal Sciences, 139, 2019. Crossref