The heat transfer coefficient over the surface of a pedestal with fillet radii has been measured using thermochromic liquid crystals and the transient heat transfer method. The tests were performed at engine representative Reynolds numbers for a geometry typical of those used in turbine blade cooling systems. The heat conduction process that occurs in the engine was subsequently modeled numerically with a finite element discretization of the solid pedestal. The measured heat transfer coefficients were used to derive the exact boundary conditions applicable to the engine. The temperature field within the pedestal, calculated using the correct heat transfer coefficient distribution, is compared to that calculated using an area-averaged heat transfer coefficient. Metal temperature differences of 90 K are predicted across the blade wall.

Issue Section:
Research Papers
Topics:
Engines, Heat transfer coefficients, Thermal analysis, Temperature, Blades, Boundary-value problems, Cooling systems, Finite element analysis, Geometry, Heat conduction, Liquid crystals, Metals, Reynolds number, Transient heat transfer, Turbine blades
1.
Brigham, B. A., and Van Fossen, G. J., 1983, “Length to Diameter Ratio and Row Number Effects in Short Pin Fin Heat Transfer,” ASME Paper No. 83-GT-138.
2.
Byerley, A. R., Jones, T. V., and Ireland, P. T., 1992, “Internal Cooling Passage Heat Transfer Near the Entrance to a Film Cooling Hole: Experimental and Computational Results,” ASME Paper No. 92-GT-241.
3.
Chyu
M. K.
,
1990
, “
Heat Transfer and Pressure Drop for Short Pin-Fin Arrays With Pin Endwall Fillet
,”
ASME Journal of Heat Transfer
, Vol.
112
, pp.
926
–
932
.
4.
Goldstein
R. J.
, and
Karni
J.
,
1984
, “
The Effect of a Wall Boundary Layer on Local Mass Transfer From a Cylinder in Crossflow
,”
ASME Journal of Heat Transfer
, Vol.
106
, pp.
XX-OO
XX-OO
.
5.
Holland, M. J., 1991, “Rotor Blade Cooling in HP Turbines,” Rolls-Royce report, GN30498.
6.
Ireland, P. T., and Jones, T. V., 1986, “Detailed Measurements of Heat Transfer on and Around a Pedestal in Fully Developed Passage Flow,” Proceedings of 8th International Heat Transfer Conference, San Francisco, pp. 975–980.
7.
Ireland, P. T., 1987, “Internal Cooling of Turbine Blades,” D.Phil Thesis, University of Oxford, United Kingdom.
8.
Jones, T. V., Wang, Z., and Ireland, P. T., 1992, “Liquid Crystals in Aerodynamic and Heat Transfer Testing,” Proceedings of Optical Methods and Data Processing in Heat and Fluid Flow, I.Mech.E., London.
9.
Kays and Crawford, 1980, Convective Heat and Mass Transfer, 2nd ed., McGraw-Hill, New York, p. 141.
10.
Metzger, D. E., Shepard, W. B., and Haley, S. W., 1986, “Row Resolved Heat Transfer Variations in Pin Fin Arrays Including the Effects of Non-uniform Arrays and Flow Convergence,” ASME Paper No. 86-GT-132.
11.
Shen, J.-R., Ireland, P. T., Wang, Z., and Jones, T. V., 1991, “Heat Transfer Coefficient Enhancement in a Gas Turbine Blade Cooling Passage Due to Film Cooling Holes,” Proceedings of the Institution of Mechanical Engineers, Turbomachinery, I.Mech.E., London, pp. 219–226.
12.
Sparrow
E. M.
,
Stahl
T. J.
, and
Traub
P.
,
1984
, “
Heat Transfer Adjacent to the Attached End of a Cylinder in Crossflow
,”
International Journal of Heat Transfer
, Vol.
27
, pp.
233
–
242
.
13.
Van Fossen
G. J.
,
1982
, “
Heat Transfer Coefficients for Staggered Arrays of Short Pin Fins
,”
ASME Journal of Heat Transfer
, Vol.
104
, pp.
268
–
274
.
14.
Wang, Z., Ireland, P. T., and Jones, T. V., 1990, “A Technique for Measuring Convective Heat Transfer at Rough Surfaces,” ASME Paper No. 90-GT-300.
15.
Wang, Z., 1991, “The Application of Thermochromic Liquid Crystals to Detailed Turbine Blade Cooling Measurements,” D.Phil Thesis, University of Oxford, United Kingdom.
16.
Zukauskas
A. A.
,
1972
, “
Heat Transfer From Tubes in Cross Flow
,”
Advances in Heat Transfer
, Vol.
8
, pp.
116
–
133
.
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