In the present paper, aerodynamic and thermal performance of a linear nozzle vane cascade is fully assessed. Tests have been carried out with and without platform cooling, with coolant ejected through a slot located upstream of the leading edge. Cooling air is also ejected through a row of cylindrical holes located upstream of the slot, simulating a combustor cooling system. The cascade was tested at a high inlet turbulence intensity level (Tu1 = 9%) and at variable cooling injection conditions. Aero-thermal characterization of vane platform was obtained through 5-hole probe measurements, oil & dye surface flow visualizations, measurements of end wall adiabatic film cooling effectiveness and heat transfer coefficient. The platform cooling scheme operated at nominal injection rate was shown to effectively reduce the heat load over most of the platform surface, with only a small increase in secondary flows loss. Combustor holes injection resulted beneficial in controlling momentum of coolant approaching the cascade, thus limiting the secondary flows growth and resulting in an increase of the coolant film length inside of the passage.
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ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
June 15–19, 2015
Montreal, Quebec, Canada
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5672-7
PROCEEDINGS PAPER
Aerodynamic and Heat Transfer Characterization of a Nozzle Vane Cascade With and Without Platform Cooling
G. Barigozzi,
G. Barigozzi
Università degli Studi di Bergamo, Dalmine, BG, Italy
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A. Perdichizzi,
A. Perdichizzi
Università degli Studi di Bergamo, Dalmine, BG, Italy
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J. Krueckels
J. Krueckels
Alstom Power, Baden, Switzerland
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G. Barigozzi
Università degli Studi di Bergamo, Dalmine, BG, Italy
A. Perdichizzi
Università degli Studi di Bergamo, Dalmine, BG, Italy
M. Henze
Alstom Power, Baden, Switzerland
J. Krueckels
Alstom Power, Baden, Switzerland
Paper No:
GT2015-42845, V05BT12A023; 11 pages
Published Online:
August 12, 2015
Citation
Barigozzi, G, Perdichizzi, A, Henze, M, & Krueckels, J. "Aerodynamic and Heat Transfer Characterization of a Nozzle Vane Cascade With and Without Platform Cooling." Proceedings of the ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. Volume 5B: Heat Transfer. Montreal, Quebec, Canada. June 15–19, 2015. V05BT12A023. ASME. https://doi.org/10.1115/GT2015-42845
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