Effects of Downstream Vortex Generators on Film Cooling a Flat Plate Fed by Crossflow

Straub, Douglas; Weber, Justin; Roy, Arnab; Lee, Chien-Shing; Shih, Tom I-P.

doi:10.1115/1.4064316

Effects of Downstream Vortex Generators on Film Cooling a Flat Plate Fed by Crossflow

Journal Article · Tue Jan 16 00:00:00 EST 2024 · Journal of Turbomachinery

DOI:https://doi.org/10.1115/1.4064316· OSTI ID:2348949

Straub, Douglas ^[1]; Weber, Justin ^[1]; Roy, Arnab ^[1]; Lee, Chien-Shing ^[2]; Shih, Tom I-P. ^[2]

National Energy Technology Laboratory (NETL), Morgantown, WV (United States)
Purdue Univ., West Lafayette, IN (United States)

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. Here, 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.

View Accepted Manuscript (DOE)

Research Organization:: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy and Carbon Management (FECM)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2348949

Journal Information:: Journal of Turbomachinery, Journal Name: Journal of Turbomachinery Journal Issue: 5 Vol. 146; ISSN 0889-504X

Publisher:: ASMECopyright Statement

Country of Publication:: United States

Language:: English

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