The distribution of adiabatic film-cooling effectiveness on the endwall of a large-scale low-speed linear turbine cascade has been measured using a new technique. This technique is based on an established surface-flow visualization technique, and makes use of the reaction between ammonia gas and a diazo surface coating. A new method of calibration has been developed to relate the result of the reaction to surface concentration of coolant. Using the analogy that exists between heat and mass transfer, the distribution of film-cooling effectiveness can then be determined. The complete representation of the film-cooling effectiveness distribution provided by the technique reveals the interaction between the coolant ejected from the endwall and the secondary flow in the turbine blade passage. Over- and undercooled regions on the endwall are identified, illustrating the need to take these interactions into account in the design process. Modifications to the cooling configuration examined in this paper are proposed as a result of the application of the ammonia and diazo technique.

1.
Bario
F.
,
Leboeuf
F.
,
Onvani
A.
, and
Seddini
A.
,
1990
, “
Aerodynamics of Cooling Jets Introduced in the Secondary Flow of a Low-Speed Turbine Cascade
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
112
, pp.
539
546
.
2.
Blair
M. F.
,
1974
, “
An Experimental Study of Heat Transfer and Film Cooling on Large-Scale Turbine Endwalls
,”
ASME Journal of Heat Transfer
, Vol.
96
, pp.
524
529
.
3.
Bogard, D. G., 1985, private communications, University of Texas at Austin, USA.
4.
Bourguignon, A. E., 1985, “Etudes des Transferts Thermiques sur les Plates-Formes de Distributeur de Turbine avec et sans Film de Refroidissement,” AGARD-CP-390, Heat Transfer and Cooling in Gas Turbines.
5.
Dring
R. P.
,
Blair
M. F.
, and
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.
Friedrichs, S., and Hodson, H. P., 1994, “The Ammonia and Diazo Surface Coating Technique for Measuring Adiabatic Film Cooling Effectiveness,” Proc. 12th Symposium on Measuring Techniques for Transonic and Supersonic Flow in Cascades and Turbomachines, Prague, The Czech Republic.
7.
Goldman, L. J., and McLallin, K. L., 1977, “Effect of Endwall Cooling on Secondary Flows in Turbine Stator Vanes,” AGARD-CPP-214.
8.
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.
9.
Gaugler
R. E.
, and
Russell
L. M.
,
1984
, “
Comparison of Visualized Turbine Endwall Secondary Flows and Measured Heat Transfer Patterns
,”
ASME Journal of Engineering for Gas Turbines and Power
, Vol.
106
, pp.
168
172
.
10.
Harasgama
S. P.
, and
Burton
C. D.
,
1992
, “
Film Cooling Research on the Endwall of a Turbine Nozzle Guide Vane in a Short Duration Annular Cascade: Part 1—Experimental Technique and Results
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
114
, pp.
734
740
.
1.
Harrison, S., 1989, “The Influence of Blade Stacking on Turbine Losses,” Ph.D. Thesis, University of Cambridge;
2.
see also
Harrison
S.
,
1990
, “
Secondary Loss Generation in a Linear Cascade of High-Turning Turbine Blades
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
112
, pp.
618
624
.
1.
Haslinger, W., and Hennecke, D. K., 1994, private communications, Technische Hochschule Darmstadt, Germany.
2.
Hodson
H. P.
, and
Addison
J. S.
,
1989
, “
Wake-Boundary Layer Interactions in an Axial Flow Turbine Rotor at Off-Design Conditions
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
111
, pp.
181
192
.
3.
Jabbari
M. Y.
,
Marston
K. C.
,
Eckert
E. R. G.
, and
Goldstein
R. J.
,
1996
, “
Film Cooling of the Gas Turbine Endwall by Discrete-Hole Injection
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
118
, pp.
278
284
.
4.
Joslyn, H. D., and Dring, R. P., 1983, “Turbine Rotor Negative Incidence Stall,” ASME Paper No. 83-GT-23.
5.
Leylek
J. H.
, and
Zerkle
R. D.
,
1994
, “
Discrete-Jet Film Cooling: A Comparison of Computational Results With Experiments
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
116
, pp.
358
368
.
6.
Pedersen
D. R.
,
Eckert
E. R. G.
, and
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
.
7.
Schmidt
D. L.
,
Sen
B.
, and
Bogard
D. G.
,
1996
, “
Film Cooling with Compound Angle Holes: Adiabatic Effectiveness
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
118
, this issue, pp.
807
813
.
8.
Shadid
J. N.
, and
Eckert
E. R. G.
,
1991
, “
The Mass Transfer Analogy to Heat Transfer in Fluids with Temperature-Dependent Properties
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
113
, pp.
27
33
.
9.
Sieverding, C. H., and Wilputte, P., 1981, “Influence of Mach Number and Endwall Cooling on Secondary Flows in a Straight Nozzle Cascade,” ASME Journal of Engineering for Gas Turbines and Power, Vol. 103, No. 2.
10.
Sieverding
C. H.
,
1984
, “
Recent Progress in the Understanding of Basic Aspects of Secondary Flows in Turbine Blade Passages
,”
ASME Journal of Engineering for Gas Turbines and Power
, Vol.
107
, pp.
248
257
.
11.
Sinha
A. K.
,
Bogard
D. G.
, and
Crawford
M. E.
,
1991
, “
Film-Cooling Effectiveness Downstream of a Single Row of Holes With Variable Density Ratio
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
113
, pp.
442
449
.
12.
Soechting, F. O., Landis, K. K., and Dobrowolski, R., 1987, “Development of Low-Cost Test Techniques for Advancing Film Cooling Technology,” Paper No. AIAA-87-1913.
13.
Takeishi
K.
,
Matsuura
M.
,
Aoki
S.
, and
Sato
T.
,
1990
, “
An Experimental Study of Heat Transfer and Film Cooling on Low Aspect Ratio Turbine Nozzles
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
112
, pp.
488
496
.
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