This work supports new gas turbine designs for improved performance by evaluating endwall leakage and assembly features in a cascade that is representative of a first stage stator passage. The present paper documents component misalignment and leakage flow effects on the aerodynamic losses within a passage having one contoured and one straight endwall. Steps on the endwall and leakage flows through the endwall can lead to thicker endwall boundary layers, stronger secondary flows and possibly additional vortex structures in the passage. The paper compares losses with steps of various geometries and leakage of various flow rates to assess their importance on aerodynamic losses in this contoured passage. In particular, features associated with the combustor-to-turbine transition piece and the slash-face gap, a gap between two vane segments on the vane platform, are addressed.

1.
Herzig, H. Z., Hansen, A. G., and Costello, G. R., 1954. Visualization study of secondary flows in cascades. Tech. rep., National Advisory Committee for Aeronautics, Washington, DC, United States. NACA Report 1163.
2.
Langston
L. S.
,
Nice
M. L.
, and
Hooper
R. M.
,
1977
. “
Three-dimensional flow within a turbine cascade passage
.”
J. Engineering for Power
,
99
, pp.
21
28
.
3.
Langston
L. S.
,
1980
. “
Crossflows in a turbine cascade passage
.”
J. Engineering for Power
,
102
, pp.
866
874
.
4.
Diech, M., Zaryankin, A., Filippov, G., and Zatsepin, N., 1960. “Method of increasing the efficiency of turbine stages with short blades.” Translation No. 2816 Associated Electrical Industries (Manchester) Limited.
5.
Morris, A. W. H., and Hoare, R. G., 1975. “Secondary loss measurements in a cascade of turbine blades with meridional wall profiling.” ASME (Paper), 75-WA/GT-13.
6.
Kopper
F. C.
,
Milano
R.
, and
Vanco
M.
,
1981
. “
Experimental investigation of endwall profiling in a turbine vane cascade
.”
AIAA Journal
,
19
(
8
), pp.
1033
1040
.
7.
Dossena
V.
,
Perdichizzi
A.
, and
Savini
M.
,
1999
. “
Influence of endwall contouring on the performance of a turbine nozzle guide vane
.”
Journal of Turbomachinery
,
121
(
2
), pp.
200
208
.
8.
Burd, S., and Simon, T., 2000. “Flow measurements in a nozzle guide vane passage with a low aspect ratio and endwall contouring.” ASME (Paper), 2000-GT-0213.
9.
Kawai
T.
,
Shinoki
S.
, and
Adachi
T.
,
1989
. “
Secondary flow control and loss reduction in a turbine cascade using endwall fences
.”
JSME International Journal, Series II (Fluids Engineering, Heat Transfer, Power, Combustion, Thermophysical Properties)
,
32
(
3
), 08, pp.
375
87
.
10.
Chung, J. T., Simon, T. W., and Buddhavarapu, J., 1991. “Three-dimensional flow near the blade/endwall junction of a gas turbine: application of a boundary layer fence.” ASME (Paper), 91-GT-45.
11.
Chung, J. T., and Simon, T. W., 1993. “Effectiveness of the gas turbine endwall fences in secondary flow control at elevated freestream turbulence levels.” ASME (Paper), 93-GT-51.
12.
Aunapu
N. V.
,
Volino
R. J.
,
Flack
K. A.
, and
Stoddard
R. M.
,
2000
. “
Secondary flow measurements in a turbine passage with endwall flow modification
.”
Journal of Turbomachinery
,
122
, pp.
651
658
.
13.
Yamao, H., Aoki, S., Takeshi, K., and Takeda, K., 1987. “An experimental study for endwall cooling design of turbine vanes.” Proceeding of the International Gas Turbine Society of Japan, 87-TOKYO-IGTC-67.
14.
Blair
M. F.
,
1974
. “
Experimental study of heat transfer and film cooling on large-scale turbine endwalls
.”
ASME Journal of Heat Transfer
,
96
, pp.
524
529
.
15.
Granser, D., and Schulenberg, T., 1990. “Prediction and measurment of film cooling effectiveness for a first-stage turbine vane shroud.” ASME (Paper), 90-GT95.
16.
Friedrichs, S., H.P., H., and Dawes, W. N., 1995. “Distribution of film-cooling effectiveness on a turbine endwall measured using the ammonia and diazo technique.” ASME (Paper), 95-GT-1.
17.
Friedrichs
S.
,
Hodson
H. P.
, and
Dawes
W. N.
,
1997
. “
Aerodynamic aspects of endwall film-cooling
.”
Journal of Turbomachinery
,
119
, pp.
786
793
.
18.
Roy, R. P., Squires, K. D., Gerendas, M., Song, S., Howe, W. J., and Ansari, A., 2000. “Flow and heat transfer at the hub endwall of inlet vane passages - experiments and simulations.” ASME (Paper), 2000-GT-198.
19.
Kost
F
, and
Nicklas
M.
,
2001
. “
Film-cooled turbine endwall in a transonic flow field: Part 1 - aerodynamic measurements
.”
Journal of Turbomachinery
,
123
(
4
), pp.
709
719
.
20.
Knost, D. G., and Thole, K. A., 2003. “Computational predictions of endwall film-cooling for a first stage vane.” ASME (Paper), GT2003-38252, pp. 163–173.
21.
Georgiou, D. P., Papavasilopoulos, V. A., and Alevisos, M., 1996. “Experimental contribution on the significance and the control by transverse injection of the horseshoe vortex.” ASME (Paper), 96-GT-255.
22.
Piggush, J., and Simon, T., 2005. “Heat transfer measurements in a first stage nozzle cascade having endwall contouring, leakage and assembly features.” ASME (Paper), HT2005-72573.
23.
Piggush, J., and Simon, T., 2005. “Flow measurements in a first stage nozzle cascade having endwall contouring, leakage and assembly features.” ASME (Paper), GT2005-68340.
24.
Ames, F., 1994. Experimental study of vane heat transfer and film cooling at elevated levels of turbulence. Tech. Rep. CR-19825, NASA.
25.
Oke, R., Simon, T., Shih, T., Zhu, B., Lin, L., and Chyu, M., 2001. “Measurements over a film-cooled, contoured endwall with various coolant injection rates.” ASME (Paper), 2001-GT-0140.
26.
Hancock
P.
, and
Bradshaw
P.
,
1983
. “
The effect of free-stream turbulence on turbulent boundary layer flow and heat transfer
.”
J. Fluids Engr.
,
105
, p.
284
284
.
27.
Simon, T., and Goldstein, R., 1996. Handbook of Fluid Dynamics and Fluid Machinery. Wiley, New York, ch. Instramentation for Fluid Dynamics - Pressure Measurements.
This content is only available via PDF.
You do not currently have access to this content.