Film cooling performance for injection through discrete holes in the endwall of a turbine blade is investigated. The effectiveness is measured at 60 locations in the region covered by injection. Three nominal blowing rates, two density ratios, and two approaching flow Reynolds numbers are examined. Analysis of the data reveals that even 60 locations are insufficient for the determination of the field of film cooling effectiveness with its strong local variations. Visualization of the traces of the coolant jets on the endwall surface, using ammonium-diazo-paper, provides useful qualitative information for the interpretation of the measurements, revealing the paths and interaction of the jets, which change with blowing rate and density ratio.
Issue Section:
Research Papers
1.
Blair, M., 1974, “An Experimental Study of Heat Transfer and Film Cooling on Large-Scale Turbine Endwalls,” ASME Paper No. 74-GT-33.
2.
Bourguignon, A. E., 1985, “Etudes des Transfers Thermiques sur les Plates-Formes de Distributeur de Turbine avec et sans Film de Refroidissement,” AGARD-CP-390.
3.
Chen
P. H.
Goldstein
R. J.
1992
, “Convective Transport Phenomena on the Suction Surface of a Turbine Blade Including the Influence of Secondary Flows Near the Endwall
,” ASME JOURNAL OF TURBOMACHINERY
, Vol. 114
, pp. 776
–787
.4.
Chung, J. T., and Simon, T. W., 1990, “Three-Dimensional Flow Near the Blade/Endwall Junction of a Gas Turbine: Visualization in a Large-Scale Cascade Simulator,” ASME Paper No. 90-WA/HT-4.
5.
Dring
R. P.
Blair
M. F.
Joslyn
H. D.
1980
, “An Experimental Investigation of Film Cooling on a Turbine Rotor Blade
,” ASME Journal of Engineering for Power
, Vol. 102
, pp. 81
–87
.6.
Eckert
E. R. G.
1984
, “Analysis of Film Cooling and Full-Coverage Film Cooling of Gas Turbine Blades
,” ASME Journal of Heat Transfer
, Vol. 106
, pp. 206
–213
.7.
Eckert
E. R. G.
1992
, “Similarity Analysis of Model Experiments for Film Cooling in Gas Turbines
,” Warme- und Stoffubertragung
, Vol. 27
, pp. 217
–223
.8.
Goldstein
R. J.
1971
, “Film Cooling
,” Advances in Heat Transfer
, T. F. Irvine, Jr., and J. P. Hartnett, eds., Academic Press, New York, Vol. 7
, pp. 321
–379
.9.
Goldstein
R. J.
Chen
P. H.
1985
, “Film Cooling on a Gas Turbine Blade Near the Endwall
,” ASME Journal of Engineering for Gas Turbines and Power
, Vol. 107
, pp. 117
–122
.10.
Goldstein
R. J.
Chen
P. H.
1987
, “Film Cooling of a Turbine Blade With Injection Through Two Rows of Holes in the Near-Endwall Region
,” ASME JOURNAL OF TURBOMACHINERY
, Vol. 109
, pp. 588
–593
.11.
Goldstein
R. J.
Spores
R. A.
1988
, “Turbulent Transport on the Endwall in the Region Between Adjacent Turbine Blades
,” ASME Journal of Heat Transfer
, Vol. 110
, pp. 862
–869
.12.
Goldstein, R. J., and Stone, L. D., 1994, “Row-of-Holes Film Cooling of a Convex and a Concave Wall at Low Injection Angles,” manuscript.
13.
Granser, D., and Schulenberg, T., 1990, “Prediction and Measurement of Film Cooling Effectiveness for a First-Stage Turbine Vane Shroud,” ASME Paper No. 90-GT-95.
14.
Ito
S.
Goldstein
R. J.
Eckert
E. R. G.
1978
, “Film Cooling of a Gas Turbine Blade
,” ASME Journal of Engineering for Power
, Vol. 100
, pp. 476
–481
.15.
Jabbari, M. Y., and Goldstein, R. J., 1978, “Effect of Mainstream Acceleration on Adiabatic Wall Temperature and Heat Transfer Downstream of Gas Injection,” Proceedings, 6th International Heat Transfer Conference, Toronto, Canada, Vol. 5, pp. 249–254.
16.
Jabbari
M. Y.
Goldstein
R. J.
Martson
K. C.
Eckert
E. R. G.
1992
, “Three Dimensional Flow at the Junction Between a Turbine Blade and the End-Wall
,” Warme- und Stoffubertragung
, Vol. 27
, pp. 51
–59
.17.
Moffat
R. J.
1982
, “Contribution to the Theory of Single-Sample Uncertainty Analysis
,” ASME Journal of Fluids Engineering
, Vol. 104
, pp. 250
–260
.18.
Pedersen
D. R.
Eckert
E. R. G.
Goldstein
R. J.
1977
, “Film Cooling With Large Density Differences Between the Mainstream and the Secondary Fluid Measured by the Heat-Mass Transfer Analogy
,” ASME Journal of Heat Transfer
, Vol. 99
, pp. 620
–627
; also Pedersen’s Ph.D. Thesis, Mech. Eng. University of Minnesota, 1972.19.
Sato, T., Aoki, S., Takeishi, K., and Matsuura, M., 1987, “Effect of Three-Dimensional Flow Field on Heat Transfer Problems of a Low Aspect Ratio Turbine Nozzle,” 87-TOKYO-IGTC-59.
20.
Shadid
J. N.
Eckert
E. R. G.
1991
, “The Mass Transfer Analogy to Heat Transfer in Fluids With Temperature-Dependant Properties
,” ASME JOURNAL OF TURBOMACHINERY
, Vol. 113
, pp. 27
–33
.21.
Yamao, H., Aoki, S., Takeishi, K., and Takeda, K., 1987, “An Experimental Study for Endwall Cooling Design of Turbine Vanes,” 87-TOKYO-IGTC-67.
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