The local heat transfer coefficient distribution over all four walls of a large-scale model of a gas turbine cooling passage have been measured in great detail. A new method of determine the heat transfer coefficient to the rib surface has been developed and the contribution of the rib, at 5 percent blockage, to the overall roughened heat transfer coefficient was found to be considerable. The vortex-dominated flow field was interpreted from the detailed form of the measured local heat transfer contours. Computational Fluid Dynamics calculations support this model of the flow and yield friction factors that agree with measured values. Advances in the heat transfer measuring technique and data analysis procedure that confirm the accuracy of the transient method are described in full.

Issue Section:
Research Papers
Topics:
Cooling, Gas turbines, Heat transfer, Heat transfer coefficients, Flow (Dynamics), Computational fluid dynamics, Friction, Transients (Dynamics), Vortices
1.
Andrews, G. E., Asere, A. A., Hussain, C. I., Mkpadi, M. C., and Nazadi, A., 1992, “Impingement/Effusion Cooling,” AGARD CP-527, Paper No. 30.
2.
Chew, J. W., Taylor, I. J., and Bonsell, J. J., 1996, “CFD Developments for Turbine Blade Heat Transfer,” Presented at the 3rd International Conf. on Computers in Reciprocating Engines, I. Mech. E., London, 9–10 Jan., Paper No. C499-035.
3.
Clifford, R. J., Jones, T. V., and Dunne, S. T., 1983, “Techniques for Obtaining Detailed Heat Transfer Coefficient Measurements Within Gas Turbine Blades and Vane Cooling Passages,” ASME Paper No. 83-GT-58.
4.
Florschuetz, L. W., Metzger, D. E., and Truman, C. R., 1981, “Jet Array Impingement With Crossflow-Correlation of Streamwise Resolved Flow and Heat Transfer Distributions,” NASA CR 3373.
5.
Gillespie
D. R. H.
,
Wang
Z.
,
Ireland
P. T.
, and
Kohler
S. T.
,
1998
, “
Full Surface Local Heat Transfer Coefficient Measurements in an Integrally Cast Impingement Cooling Geometry
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
120
, this issue, pp.
92
–
99
.
6.
Han
J. C.
,
Zhang
Y. M.
, and
Lee
C. P.
,
1991
, “
Augmented Heat Transfer in Square Channels With Parallel, Crossed and V-Shaped Angled Ribs
,”
ASME Journal of Heat Transfer
, Vol.
113
, pp.
590
–
596
.
7.
Ireland, P. T., Wang, Z., and Jones, T. V., 1995, “Liquid Crystal Heat Transfer Measurements,” VKI lecture series, Measurement Techniques, 1995-01.
8.
Lau
S. C.
,
McMillin
R. D.
, and
Han
J. C.
,
1991
, “
Heat Transfer Characteristics of Turbulent Flow in a Square Channel With Angled Discrete Ribs
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
113
, pp.
367
–
374
.
9.
Liou
T. M.
, and
Hwang
J. J.
,
1993
, “
Effects of Ridge Shapes on Turbulent Heat Transfer and Friction in a Rectangular Channel
,”
Int. Journal of Heat and Mass Transfer
, Vol.
36
, pp.
931
–
940
.
10.
Lockett
J. F.
, and
Collins
M. W.
,
1990
, “
Holographic Interferometry Applied to Rib-Roughness Heat Transfer in Turbulent Flow
,”
Int. Journal of Heat and Mass Transfer
, Vol.
33
, No.
11
, pp.
2439
–
2449
.
11.
Shen
J. R.
,
Ireland
P. T.
,
Wang
Z.
,
Jones
T. V.
, and
Byerley
A. R.
,
1996
, “
Heat Transfer Enhancement Within a Turbine Blade Cooling Passage Using Ribs and Combinations of Ribs With Film Cooling Holes
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
118
, pp.
428
–
434
.
12.
Taslim
M. E.
, and
Wadsworth
C. M.
,
1997
, “
An Experimental Investigation of the Rib Surface-Averaged Heat Transfer Coefficient in a Rib-Roughened Square Passage
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
119
, pp.
381
–
389
.
13.
Van Treuren, K. V., Wang, Z., Ireland, P. T., Jones, T. V., and Kohler, S. T., 1996, “Comparison of Local and Average Heat Transfer Coefficients Under an Array of Inline and Staggered Impinging Jets,” ASME Paper No. 96-GT-163.
14.
Wang, Z., Ireland, P. T., and Kohler, S. T., 1996, “Gas Temperature Measurement in Internal Cooling Passages,” ASME Paper No. 96-GT-534.
15.
Wang
Z.
,
Ireland
P. T.
,
Jones
T. V.
, and
Davenport
R.
,
1996
, “
A Color Image Processing System for Transient Liquid Crystal Heat Transfer Experiments
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
118
, pp.
421
–
427
.
16.
Wang
Z.
,
Ireland
P. T.
, and
Jones
T. V.
,
1995
, “
An Advanced Method of Processing Liquid Crystal Video Signal From Transient Heat Transfer Experiments
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
117
, pp.
184
–
189
.
17.
Wang
Z.
,
Ireland
P. T.
, and
Jones
T. V.
,
1991
, “
A Technique for Measuring Convective Heat Transfer at Rough Surfaces
,”
Trans. Inst. Measurement and Control
, Vol.
13
, No.
3
, pp.
145
–
154
.
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