Effects of Downstream Vortex Generators on Film Cooling a Flat Plate Fed by CrossflowSource: Journal of Turbomachinery:;2024:;volume( 146 ):;issue: 005::page 51011-1DOI: 10.1115/1.4064316Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Counter-rotating vortices, formed by the interaction of film-cooling jets and the hot gas flow, adversely affect the performance of conventional film-cooling designs. Downstream vortex generators have been shown to improve cooling effectiveness by mitigating the effects of the counter-rotating vortices and by deflecting the cooling jet laterally. In this study, computational and experimental methods were used to examine how cylindrical film-cooling holes (D = 3.2 mm, L/D = 6, p/D = 3, α = 30 deg) with and without downstream vortex generators perform when the coolant supply channel is perpendicular to the direction of the hot gas. For this study, the hot gas had a temperature of 650 K and an average Mach number of 0.23. The hot-gas-to-coolant temperature ratio was 1.9, and two blowing ratios (0.75 and 1.0) were studied. Results from the computational fluid dynamics study show how crossflow affects the interaction between the film-cooling jet and hot gas flow with and without downstream vortex generators. The experimental measurements were based on infrared thermography in a conjugate heat transfer environment. Results were obtained for film-cooling performance in terms of overall effectiveness, film effectiveness, and local heat transfer coefficients. The downstream vortex generators can increase the laterally averaged effectiveness by a factor of 1.5 relative to cylindrical holes, but this higher performance is restricted to low crossflow velocities and higher blowing ratios.
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contributor author | Straub, Douglas | |
contributor author | Weber, Justin | |
contributor author | Roy, Arnab | |
contributor author | Lee, Chien-Shing | |
contributor author | Shih, Tom I-P. | |
date accessioned | 2024-04-24T22:50:43Z | |
date available | 2024-04-24T22:50:43Z | |
date copyright | 1/16/2024 12:00:00 AM | |
date issued | 2024 | |
identifier issn | 0889-504X | |
identifier other | turbo_146_5_051011.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4295973 | |
description abstract | Counter-rotating vortices, formed by the interaction of film-cooling jets and the hot gas flow, adversely affect the performance of conventional film-cooling designs. Downstream vortex generators have been shown to improve cooling effectiveness by mitigating the effects of the counter-rotating vortices and by deflecting the cooling jet laterally. In this study, computational and experimental methods were used to examine how cylindrical film-cooling holes (D = 3.2 mm, L/D = 6, p/D = 3, α = 30 deg) with and without downstream vortex generators perform when the coolant supply channel is perpendicular to the direction of the hot gas. For this study, the hot gas had a temperature of 650 K and an average Mach number of 0.23. The hot-gas-to-coolant temperature ratio was 1.9, and two blowing ratios (0.75 and 1.0) were studied. Results from the computational fluid dynamics study show how crossflow affects the interaction between the film-cooling jet and hot gas flow with and without downstream vortex generators. The experimental measurements were based on infrared thermography in a conjugate heat transfer environment. Results were obtained for film-cooling performance in terms of overall effectiveness, film effectiveness, and local heat transfer coefficients. The downstream vortex generators can increase the laterally averaged effectiveness by a factor of 1.5 relative to cylindrical holes, but this higher performance is restricted to low crossflow velocities and higher blowing ratios. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Effects of Downstream Vortex Generators on Film Cooling a Flat Plate Fed by Crossflow | |
type | Journal Paper | |
journal volume | 146 | |
journal issue | 5 | |
journal title | Journal of Turbomachinery | |
identifier doi | 10.1115/1.4064316 | |
journal fristpage | 51011-1 | |
journal lastpage | 51011-15 | |
page | 15 | |
tree | Journal of Turbomachinery:;2024:;volume( 146 ):;issue: 005 | |
contenttype | Fulltext |