A thermal barrier coating (TBC)-coated turbine blade coupon was exposed to successive deposition in an accelerated deposition facility simulating flow conditions at the inlet to a first stage high pressure turbine (T=1150°C, M=0.31). The combustor exit flow was seeded with dust particulate that would typically be ingested by a large utility power plant. The turbine coupon was subjected to four successive 2h deposition tests. The particulate loading was scaled to simulate 0.02 parts per million weight (ppmw) of particulate over 3months of continuous gas turbine operation for each 2h laboratory simulation (for a cumulative 1year of operation). Three-dimensional maps of the deposit-roughened surfaces were created between each test, representing a total of four measurements evenly spaced through the lifecycle of a turbine blade surface. From these measurements, scaled models were produced for testing in a low-speed wind tunnel with a turbulent, zero pressure gradient boundary layer at Re=750,000. The average surface heat transfer coefficient was measured using a transient surface temperature measurement technique. Stanton number increases initially with deposition but then levels off as the surface becomes less peaked. Subsequent deposition exposure then produces a second increase in St. Surface maps of St highlight the local influence of deposit peaks with regard to heat transfer.

1.
Borom
,
M. P.
,
Johnson
,
C. A.
, and
Peluso
,
L. A.
, 1996, “
Role of Environmental Deposits and Operating Surface Temperature in Spallation of Air Plasma Sprayed Thermal Barrier Coatings
,”
Surf. Coat. Technol.
0257-8972,
86–87
, pp.
116
126
.
2.
Wenglarz
,
R. A.
, and
Fox
,
R. G.
, Jr.
, 1990, “
Physical Aspects of Deposition From Coal-Water Fuels Under Gas Turbine Conditions
,”
J. Eng. Gas Turbines Power
0742-4795,
120
, pp.
9
14
.
3.
Tarada
,
F.
, and
Suzuki
,
M.
, 1993, “
External Heat Transfer Enhancement to Turbine Blading due to Surface Roughness
,” ASME Paper No. 93-GT-74.
4.
Bons
,
J. P.
, 2002, “
St and Cf Augmentation for Real Turbine Roughness with Elevated Freestream Turbulence
,”
ASME J. Turbomach.
0889-504X,
124
, pp.
632
644
.
5.
Kim
,
J.
,
Dunn
,
M. G.
, and
Baran
,
A. J.
,
et al.
, 1993, “
Deposition of Volcanic Materials in the Hot Sections of Two Gas Turbine Engines
,”
J. Eng. Gas Turbines Power
0742-4795,
115
, pp.
641
651
.
6.
Acharya
,
M.
,
Bornstein
,
J.
, and
Escudier
,
M.
, 1986, “
Turbulent Boundary Layers on Rough Surfaces
,”
Exp. Fluids
0723-4864,
4
, pp.
33
47
.
7.
Hoffs
,
A.
,
Drost
,
U.
, and
Bolcs
,
A.
, 1996, “
Heat Transfer Measurements on a Turbine Airfoil at Various Reynolds Numbers and Turbulence Intensities Including Effects of Surface Roughness
,” ASME Paper No. 96-GT-169.
8.
Blair
,
M. F.
, 1994, “
An Experimental Study of Heat Transfer in a Large-Scale Turbine Rotor Passage
,”
J. Turbomach.
0889-504X,
116
(
1
), pp.
1
13
.
9.
Guo
,
S. M.
,
Jones
,
T. V.
,
Lock
,
G. D.
, and
Dancer
,
S. N.
, 1998, “
Computational Prediction of Heat Transfer to Gas Turbine Nozzle Guide Vanes With Roughened Surfaces
,”
J. Turbomach.
0889-504X,
120
(
2
), pp.
343
350
.
10.
Wammack
,
J. E.
,
Crosby
,
J.
,
Fletcher
,
D.
,
Bons
,
J. P.
, and
Fletcher
,
T. H.
, 2008, “
Evolution of Surface Deposits on a High-Pressure Turbine Blade—Part I: Physical Characteristics
,”
ASME J. Turbomach.
0889-504X,
130
(
2
), p.
021020
.
11.
Jensen
,
J. W.
,
Squire
,
S. W.
, and
Bons
,
J. P.
, 2005, “
Simulated Land-Based Turbine Deposits Generated in an Accelerated Deposition Facility
,”
ASME J. Turbomach.
0889-504X,
127
, pp.
462
470
.
12.
Bons
,
J. P.
, 2005, “
A Critical Assessment of Reynolds Analogy for Turbine Flows
,”
ASME J. Heat Transfer
0022-1481,
127
, pp.
472
485
.
13.
Bogard
,
D. G.
,
Schmidt
,
D. L.
, and
Tabbita
,
M.
, 1998, “
Characterization and Laboratory Simulation of Turbine Airfoil Surface Roughness and Associated Heat Transfer
,”
J. Turbomach.
0889-504X,
120
(
2
), pp.
337
342
.
14.
Barlow
,
D. N.
, and
Kim
,
Y. W.
, 1995, “
Effect of Surface Roughness on Local Heat Transfer and Film Cooling Effectiveness
,” ASME Paper No. 95-GT-14.
15.
Antonia
,
R. A.
, and
Luxton
,
R. E.
, 1971, “
The Response of a Turbulent Boundary Layer to a Step Change in Surface Roughness. Part 1: Smooth to Rough
,”
J. Fluid Mech.
0022-1120,
48
, pp.
721
726
.
16.
Taylor
,
R. P.
, and
Chakroun
,
W. M.
, 1992, “
Heat Transfer in the Turbulent Boundary Layer with a Short Strip of Surface Roughness
,” AIAA Paper No. 92-0249.
17.
Schlichting
,
H.
, 1979,
Boundary Layer Theory
,
7th ed.
,
McGraw-Hill
,
New York
.
18.
Dipprey
,
D. F.
, and
Sabersky
,
R. H.
, 1962, “
Heat and Momentum Transfer in Smooth and Rough Tubes at Various Prandtl Numbers
,”
Int. J. Heat Mass Transfer
0017-9310,
6
, pp.
329
353
.
19.
Henry
,
R. C.
,
Hansman
,
R. J.
, and
Breuer
,
K. S.
, 1995, “
Heat Transfer Variation on Protuberances and Surface Roughness Elements
,”
J. Thermophys. Heat Transfer
0887-8722,
9
(
1
), pp.
175
180
.
You do not currently have access to this content.