Gas turbine blade life is often limited by the effectiveness of the cooling in the trailing edge convective cavity, which generally has a narrow cross-section. Previous research on rotational effects considered cavity shapes quite different from those of typical trailing edge cavities. In this research, experiments were conducted to determine the effect of rotation on heat transfer in ducts of narrow cross-section (height-to-width ratio of 1:10), oriented with the heated sides at 60° to the r-z plane. In the experiment, a high-molecular-weight gas (Refrigerant-134A) at ambient pressure and temperature conditions was used to match the dimensionless parameters at engine conditions. Thin foil heaters were used to produce a constant heat flux at the long sides of the duct; the narrow sides were unheated. Duct Reynolds numbers were varied up to 20,000; rotation numbers were varied up to 0.25. The test results show the effect of rotation and aspect ratio on duct leading and trailing side heat transfer. In addition, the results show the variation in heat transfer coefficient with transverse location in the duct, demonstrating the effect of rotation not only on lead and trail side heat transfer, but also on forward and aft end heat transfer.

Issue Section:
Technical Papers
Keywords:
gas turbines, heat transfer, cooling, rotational flow, convection, foils
Topics:
Ducts, Heat transfer, Rotation, Buoyancy
1.
Mori
,
Y.
,
Fukada
,
T.
, and
Nakayama
,
W.
,
1971
, “
Convective Heat Transfer in a Rotating Radial Circular Pipe (2nd Report)
,”
Int. J. Heat Mass Transf.
,
14
, pp.
1807
–
1824
.
2.
Wagner, J. H., Johnson, B. V., and Hajek, T. J., 1989, “Heat Transfer in Rotating Passages With Smooth Walls and Radial Outward Flow,” ASME Paper No. 89-GT-272.
3.
Johnson, B. V., Wagner, J. H., and Kopper, F. C., 1990, “Heat Transfer in Rotating Serpentine Passages With Smooth Walls,” ASME Paper No. 90-GT-331.
4.
Soong
,
C. Y.
,
Lin
,
S. T.
, and
Hwang
,
G. J.
,
1991
, “
An Experimental Study of Convective Heat Transfer in Radially Rotating Rectangular Ducts
,”
ASME J. Heat Transfer
,
113
, pp.
604
–
611
.
5.
Kuo, C. R., and Hwang, G. J., 1994, “Aspect Ratio Effect on Convective Heat Transfer of Radially Outward Flow in Rotating Rectangular Ducts,” 5th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, Kaanapali, HI.
6.
Zhang
,
N.
,
Chiou
,
J.
,
Fann
,
S.
, and
Yang
,
W.-J.
,
1993
, “
Local Heat Transfer Distribution in a Rotating Serpentine Rib-Roughened Flow Passage
,”
ASME J. Heat Transfer
,
115
, pp.
560
–
567
.
7.
Han
,
J. C.
,
Zhang
,
Y.-M.
, and
Kalkuehler
,
K.
,
1993
, “
Uneven Wall Temperature Effect on Local Heat Transfer in a Rotating Two-Pass Square Channel With Smooth Walls
,”
ASME J. Heat Transfer
,
115
, pp.
912
–
920
.
8.
Han
,
J. C.
,
Zhang
,
Y.-M.
, and
Lee
,
C. P.
,
1994
, “
Influence of Surface Heating Condition on Local Heat Transfer in a Rotating Square Channel With Smooth Walls and Radial Outward Flow
,”
ASME J. Turbomach.
,
116
, pp.
149
–
158
.
9.
Mochizuki
,
S.
,
Takamura
,
J.
,
Yamawaki
,
S.
, and
Yang
,
W.-J.
,
1994
, “
Heat Transfer in Serpentine Flow Passages With Rotation
,”
ASME J. Turbomach.
,
116
, pp.
133
–
140
.
10.
Parsons
,
J. A.
,
Han
,
J. C.
, and
Zhang
,
Y.
,
1995
, “
Effect of Model Orientation and Wall Heating Condition on Local Heat Transfer in a Rotating Two-Pass Square Channel With Rib Turbulators
,”
Int. J. Heat Mass Transf.
,
38
, No.
7
, pp.
1151
–
1159
.
11.
Parsons
,
J. A.
,
Han
,
J. C.
, and
Zhang
,
Y.
,
1994
, “
Wall Heating on Local Heat Transfer in a Rotating Two-Pass Square Channel With 90 deg Rib Turbulators
,”
Int. J. Heat Mass Transf.
,
37
, No.
9
, pp.
1411
–
1420
.
12.
Dutta
,
S.
,
Han
,
J.-C.
, and
Lee
,
C. P.
,
1995
, “
Experimental Heat Transfer in a Rotating Triangular Duct: Effect of Model Orientation
,”
ASME J. Heat Transfer
,
117
, pp.
1058
–
1061
.
13.
Morris
,
W. D.
, and
Chang
,
S. W.
, May
1998
, “
Heat Transfer in a Radially Rotating Smooth-Walled Tube
,”
Aeronautical J.
,
102
, pp.
277
–
285
.
14.
Park
,
C. W.
, and
Lau
,
S. C.
,
1998
, “
Effect of Channel Orientation on Local Heat (Mass) Transfer Distributions in a Rotating Two-Pass Square Channel With Smooth Walls
,”
ASME J. Heat Transfer
,
120
, pp.
624
–
632
.
15.
Willett, F. T., 1999, “An Experimental Study of the Effects of Rotation onConvective Heat Transfer in Smooth and Pin Fin Ducts of Narrow Cross-section,” Ph.D. thesis, Rensselaer Polytechnic Institute.
16.
Kays, W. M., and Crawford, M. E., 1980, Convective Heat and Mass Transfer, McGraw-Hill, New York.
17.
Kline, S. J., and McClintock, F. A., January 1953, “Describing Uncertainties in Single-Sample Experiments,” Mechanical Engineering, Jan., pp. 3–8.
Copyright © 2001
 by ASME
You do not currently have access to this content.