Detailed parametric study of film-cooling effectiveness was carried out on a turbine blade platform of a five-blade linear cascade. The parameters chosen were freestream turbulence intensity, upstream stator-rotor purge flow rate, discrete-hole film-cooling blowing ratio, and coolant-to-mainstream density ratio. The measurement technique adopted was temperature sensitive paint (TSP) technique. Two turbulence intensities of 4.2% and 10.5%; three purge flows between the range of 0.25% and 0.75% of mainstream flow rate; three blowing ratios between 1.0 and 1.8; and three density ratios between 1.1 and 2.2 were investigated. Purge flow was supplied via a typical double-toothed stator-rotor seal, whereas the discrete-hole film-cooling was accomplished via two rows of cylindrical holes arranged along the length of the platform. The inlet and the exit Mach numbers were 0.27 and 0.44, respectively. Reynolds number of the mainstream flow was 7.5 * 105 based on the exit velocity and chord length of the blade. Results indicated that platform film-cooling effectiveness decreased with turbulence intensity, increased with purge flow rate and density ratio, and possessed an optimum blowing ratio value.
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June 2012
Research Papers
Influence of Coolant Density on Turbine Blade Platform Film-Cooling
Je-Chin Han
Je-Chin Han
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering,
e-mail: jc-han@tamu.edu
Texas A&M University
, College Station, TX 77843-3123
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Je-Chin Han
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering,
Texas A&M University
, College Station, TX 77843-3123e-mail: jc-han@tamu.edu
J. Thermal Sci. Eng. Appl. Jun 2012, 4(2): 021002 (10 pages)
Published Online: April 16, 2012
Article history
Received:
April 25, 2011
Revised:
November 3, 2011
Online:
April 16, 2012
Published:
April 16, 2012
Citation
Narzary, D. P., Liu, K., and Han, J. (April 16, 2012). "Influence of Coolant Density on Turbine Blade Platform Film-Cooling." ASME. J. Thermal Sci. Eng. Appl. June 2012; 4(2): 021002. https://doi.org/10.1115/1.4005732
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