Endwall film cooling can be greatly improved if the leakage coolant flow from the upstream gap between the combustor and vane endwall is effectively engaged. In this study, such a full coverage film cooling design, called axial-row configuration, is considered and the performance is studied by measuring the film cooling effectiveness distribution using PSP technique. Experiments were performed in a blow-down wind tunnel cascade facility at the isentropic exit Mach number of 0.5 corresponding to inlet Reynolds number of 3.8 × 105, based on the axial chord. Passive turbulence grid was used to generate freestream turbulence level about 19 % with a length scale of 1.7 cm. The results are presented as two-dimensional film cooling effectiveness distributions on the endwall surface with pitchwise averaged distributions in the axial direction. The focus of this study is evaluating the effect of coolant-to-mainstream mass flow ratio (MFR) and density ratio (DR) on a particular endwall cooling design. Increasing coolant amount for the upstream leakage exhibited increased local adiabatic cooling effectiveness levels with relatively uniform coverage area. However, the passage cooling was not improved at highest coolant MFR = 1.5% rather indicated an optimum value of MFR = 1% based on better coolant coverage on the endwall surface. For density ratio effect, results indicated the best performance at DR = 1.5.
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ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
June 26–30, 2017
Charlotte, North Carolina, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5089-3
PROCEEDINGS PAPER
Turbine Vane Endwall Film Cooling Study From Axial-Row Configuration With Simulated Upstream Leakage Flow
Nafiz H. K. Chowdhury,
Nafiz H. K. Chowdhury
Texas A&M University, College Station, TX
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Chao-Cheng Shiau,
Chao-Cheng Shiau
Texas A&M University, College Station, TX
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Je-Chin Han,
Je-Chin Han
Texas A&M University, College Station, TX
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Luzeng Zhang,
Luzeng Zhang
Solar Turbines Inc., San Diego, CA
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Hee-Koo Moon
Hee-Koo Moon
Solar Turbines Inc., San Diego, CA
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Nafiz H. K. Chowdhury
Texas A&M University, College Station, TX
Chao-Cheng Shiau
Texas A&M University, College Station, TX
Je-Chin Han
Texas A&M University, College Station, TX
Luzeng Zhang
Solar Turbines Inc., San Diego, CA
Hee-Koo Moon
Solar Turbines Inc., San Diego, CA
Paper No:
GT2017-63144, V05CT19A003; 12 pages
Published Online:
August 17, 2017
Citation
Chowdhury, NHK, Shiau, C, Han, J, Zhang, L, & Moon, H. "Turbine Vane Endwall Film Cooling Study From Axial-Row Configuration With Simulated Upstream Leakage Flow." Proceedings of the ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. Volume 5C: Heat Transfer. Charlotte, North Carolina, USA. June 26–30, 2017. V05CT19A003. ASME. https://doi.org/10.1115/GT2017-63144
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