A transient heat transfer method using liquid crystals has been applied to a scale model of a turbine rotor blade passage. Detailed contours of local heat transfer coefficient are presented for the passage in which the heat transfer to one wall was enhanced first by ribs and then with ribs combined with holes. The hole geometry and experimental dimensionless flow rates were representative of those occurring at the entrance to engine film cooling holes. The results for the ribbed passage are compared to established correlations for developed flow. Qualitative surface shear stress distributions were determined with liquid crystals. The complex distributions of heat transfer coefficient are discussed in light of the interpreted flow field.
Issue Section:
Research Papers
1.
Atli
V.
1988
, “Subsonic Flow Over a Two-Dimensional Obstacle Immersed in a Turbulent Boundary Layer on a Flat Surface
,” Journal of Wind Engineering and Industrial Aerodynamics
, Vol. 31
, pp. 225
–239
.2.
Baughn
J. W.
Ireland
P. T.
Jones
T. V.
Sanei
M.
1989
, “A Comparison of the Transient and Heated-Coating Methods for the Measurement of Local Heat Transfer Coefficients on a Pin Fin
,” ASME Journal of Heat Transfer
, Vol. 111
, pp. 887
–881
.3.
Bonnett
P.
Jones
T. V.
McDonnell
D. G.
1989
, “Shear Stress Measurements in Aerodynamic Testing Using Cholesteric Liquid Crystals
,” Liquid Crystals
, Vol. 6
, No. 33
, pp. 271
–280
.4.
Byerley, A. R., Ireland, P. T., Jones, T. V., and Ashton, S. A., 1988, “Detailed Heat Transfer Coefficient Measurements Near and Within the Entrance of a Film Cooling Hole,” ASME Paper No. 88-GT-155.
5.
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.
6.
Dunne, S. T., 1983, “A Study of Flow and Heat Transfer in Gas Turbine Blade Cooling Passages,” D. Phil thesis, University of Oxford.
7.
Han
J. C.
1988
, “Heat Transfer and Friction Characteristics in Rectangular Channels With Rib Turbulators
,” ASME Journal of Heat Transfer
, Vol. 110
, pp. 321
–328
.8.
Jones, T. V., Wang, Z., and Ireland, P. T., 1992, “The Use of Liquid Crystals in Aerodynamic and Heat Transfer Experiments,” Proc. of Optical Methods and Data Processing in Heat and Fluid Flow, Apr. 2–3, Institute of Mechanical Engineers.
9.
Kays, W. M., and Crawford, M. E., 1980, Convective Heat and Mass Transfer, 2nd ed., McGraw-Hill, New York.
10.
Mayle
R. E.
1991
, “Pressure Loss and Heat Transfer in Channels Roughened on Two Opposite Walls
,” ASME JOURNAL OF TURBOMACHINERY
, Vol. 113
, pp. 60
–66
.11.
Ristori, A., Servouze, Y., Errera, M. P., Dutoya, D., and Perruchini, J., 1991, “Numerical Simulation of Flows Inside Internal Cavities of Turbine Blades,” Proc. Eurotherm Conference, Heat Transfer in Single Phase Flows July 8–10.
12.
Shen, J.-R., Ireland, P. T., and Jones, T. V., 1991, “Heat Transfer Coefficient Enhancement in Gas Turbine Blade Cooling Passage Due to Film Cooling Holes,” Proc. Turbomachinery: Latest Developments in a Changing Scene, Institute of Mechanical Engineers, pp. 219–226.
13.
Wang
Z.
Ireland
P. T.
Jones
T. V.
1993
, “An Advanced Method of Processing Liquid Crystal Video Signals From Transient Heat Transfer Experiments
,” ASME Paper No. 93-GT-282; ASME JOURNAL OF TURBOMACHINERY
, Vol. 117
, 1995, pp. 184
–189
.14.
Webb
R. L.
Eckert
E. R. G.
Goldstein
R. J.
1971
, “Heat Transfer and Friction in Tubes With Repeated Rib Roughness
,” International Journal of Heat and Mass Transfer
, Vol. 14
, pp. 601
–618
.15.
Yeh, F. C., and Stepka, F. S., 1984, “Review and Status of Heat-Transfer Technology for Internal Passages of Air-Cooled Turbine Blades,” NASA Technical Paper 2232.
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