In this paper showerhead film cooling performance measured on a first stage nozzle guide vane within a linear cascade are presented and compared against steady and unsteady CFD simulations. A showerhead cooling scheme was tested at blowing ratios of BR = 2 to 4 under engine-like conditions (i.e. nominal exit Mach number of Ma2is = 0.42 and high mainstream turbulence level). Adiabatic film cooling effectiveness in the leading edge region was measured by means of wide banded Thermochromic Liquid Crystals. A borescope was used to overcome the constraints to the optical access imposed by the turbulence generator. Moreover, exit surveys detailing total pressure downstream of the cooled vane were acquired using a five-hole miniaturized aerodynamic pressure probe. In view of qualitative/quantitative validation purposes, numerical modelling based on steady RANS and Detached Eddy Simulation (DES) approach was performed for the lowest investigated BR of 2.0, which provided the best film coverage. Nevertheless the dilution of the coolant jets from the showerhead was predicted by DES, agreement with the measured cooling effectiveness in the leading edge region was still far from being achieved. Instead, the steady approach was enough to capture aerodynamic features such as vane load, wake loss and plenum to mainstream pressure ratio.
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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
Combined Experimental and Numerical Study of Showerhead Film Cooling in a Linear Nozzle Vane Cascade Available to Purchase
G. Barigozzi,
G. Barigozzi
University of Bergamo, Dalmine, BG, Italy
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S. Ravelli
S. Ravelli
University of Bergamo, Dalmine, BG, Italy
Search for other works by this author on:
G. Barigozzi
University of Bergamo, Dalmine, BG, Italy
S. Ravelli
University of Bergamo, Dalmine, BG, Italy
Paper No:
GT2015-42397, V05BT12A013; 12 pages
Published Online:
August 12, 2015
Citation
Barigozzi, G, & Ravelli, S. "Combined Experimental and Numerical Study of Showerhead Film Cooling in a Linear Nozzle Vane Cascade." Proceedings of the ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. Volume 5B: Heat Transfer. Montreal, Quebec, Canada. June 15–19, 2015. V05BT12A013. ASME. https://doi.org/10.1115/GT2015-42397
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