Gas turbines overall efficiency enhancement requires further increasing of the firing temperature and decreasing of cooling flow usage. Multihole (or effusion, or full-coverage) film cooling is widely used for hot gas path components cooling in modern gas turbines. The present study focused on the adiabatic film effectiveness measurement of a round multihole flat-plate coupon. The measurements were conducted in a subsonic open-loop wind tunnel with a generic setup to cover different running conditions. The test conditions were characterized by a constant main flow Mach number of 0.1 with constant gas temperature. Adiabatic film effectiveness was measured by pressure-sensitive paint (PSP) through mass transfer analogy. CO2 was used as the coolant to reach the density ratio of 1.5. Rig computational fluid dynamics (CFD) simulation was conducted to evaluate the impact of inlet boundary layer on testing. Experimental data cover blowing ratios (BRs) at 0.4, 0.6, 0.8, 1.0, and 2.0. Both 2D maps and lateral average profiles clearly indicated that the film effectiveness increases with increasing BR for BR < 0.8 and decreases with increasing BR for BR > 0.8. This observation agreed with coolant jet behavior of single film row, i.e., attached, detached then reattached, and fully detached. PSP data quality was then discussed in detail for validating large eddy simulation.

References

References
1.
Bunker
,
R. S.
,
2005
, “
A Review of Shaped Hole Turbine Film-Cooling Technology
,”
ASME J. Heat Transfer
,
127
(
4
), pp.
441
453
.
2.
Bogard
,
D. G.
, and
Thole
,
K. A.
,
2006
, “
Gas Turbine Film Cooling
,”
J. Propul. Power
,
22
(
2
), pp.
249
270
.
3.
Han
,
J.-C.
,
Dutta
,
S.
, and
Ekkad
,
S.
,
2012
,
Gas Turbine Heat Transfer and Cooling Technology
,
2nd ed.
,
CRC Press
,
Boca Raton, FL
.
4.
Lefebvre
,
A. H.
,
1998
,
Gas Turbine Combustion
,
2nd ed.
,
Taylor & Francis
,
Philadelphia, PA
.
5.
Martiny
,
M.
,
Schulz
,
A.
, and
Wittig
,
S.
,
1995
, “
Full-Coverage Film Cooling Investigations: Adiabatic Wall Temperatures and Flow Visualization
,”
ASME
Paper No. 95-WA/HT-4.
6.
Lin
,
Y.
,
Song
,
B.
,
Li
,
B.
, and
Liu
,
G.
,
2006
, “
Measured Film Cooling Effectiveness of Three Multihole Patterns
,”
ASME J. Heat Transfer
,
128
(
2
), pp.
192
197
.
7.
Facchini
,
B.
,
Tarchi
,
L.
,
Toni
,
L.
, and
Ceccherini
,
A.
,
2010
, “
Adiabatic and Overall Effectiveness Measurements of an Effusion Cooling Array for Turbine Endwall Application
,”
ASME J. Turbomach.
,
132
(
4
), p.
041008
.
8.
Ochs
,
M.
,
Horbach
,
T.
,
Schulz
,
A.
,
Koch
,
R.
, and
Bauer
,
H.-J.
,
2009
, “
A Novel Calibration Method for an Infrared Thermography System Applied to Heat Transfer Experiments
,”
Meas. Sci. Technol.
,
20
(
7
), p.
075103
.
9.
Carlomagno
,
G. M.
, and
Cardone
,
G.
,
2010
, “
Infrared Thermography for Convective Heat Transfer Measurements
,”
Exp. Fluids
,
49
(
6
), pp.
1187
1218
.
10.
Jones
,
T. V.
,
1999
, “
Theory for the Use of Foreign Gas in Simulating Film Cooling
,”
Int. J. Heat Fluid Flow
,
20
(
3
), pp.
349
354
.
11.
Holloway
,
D. S.
,
Leylek
,
J. H.
, and
Buck
,
F. A.
,
2002
, “
Pressure-Side Bleed Film Cooling: Part I—Steady Framework for Experimental and Computational Results
,”
ASME
Paper No. GT-2002-30471.
12.
Holloway
,
D. S.
,
Leylek
,
J. H.
, and
Buck
,
F. A.
,
2002
, “
Pressure-Side Bleed Film Cooling: Part II—Unsteady Framework for Experimental and Computational Results
,”
ASME
Paper No. GT-2002-30472.
13.
Cakan
,
M.
, and
Taslim
,
M. E.
,
2006
, “
Experimental and Numerical Study of Mass/Heat Transfer on an Airfoil Trailing-Edge Slots and Lands
,”
ASME J. Turbomach
,
129
(
2
), pp.
281
293
.
14.
Benson
,
M. J.
,
Elkins
,
C. J.
, and
Eaton
,
J. K.
,
2011
, “
Measurements of 3D Velocity and Scalar Field for a Film Cooled Airfoil Trailing Edge
,”
Exp. Fluids
,
51
(
2
), pp.
443
455
.
15.
Jonsson
,
M.
,
2010
, “
Application of Photoluminescent Measurement Techniques for Quantitative Assessment of Turbine Film Cooling
,”
Ph.D. thesis
, Swiss Federal Institute of Technology, Vaud, Switzerland.
16.
Johnson
,
B. E.
, and
Hu
,
H.
,
2014
, “
Measurement Uncertainties Analysis in the Determination of Adiabatic Film Cooling Effectiveness by Using Pressure Sensitive Paint (PSP) Technique
,”
ASME
Paper No. FEDSM2014-21230.
17.
Soghe
,
R. D.
,
Andreini
,
A.
,
Facchini
,
B.
, and
Mazzei
,
L.
,
2015
, “
Heat Transfer Enhancement due to Coolant Extraction on the Cold Side of Effusion Cooling Plates
,”
ASME J. Eng. Gas Turbines Power
,
137
(
12
), p.
122608
.
18.
Natsui
,
G.
,
Little
,
Z.
,
Kapat
,
J. S.
,
Dees
,
J. E.
, and
Laskowski
,
G.
,
2015
, “
A Detailed Uncertainty Analysis of Adiabatic Film Cooling Effectiveness Measurements Using Pressure Sensitive Paint
,”
ASME
Paper No. GT2015-42707.
19.
Caciolli
,
G.
,
Facchini
,
B.
,
Picchi
,
A.
, and
Tarchi
,
L.
,
2013
, “
Comparison Between PSP and TLC Steady State Techniques for Adiabatic Effectiveness Measurement on a Multiperforated Plate
,”
Exp. Therm. Fluid Sci.
,
48
, pp.
122
133
.
20.
Yang
,
Z.
, and
Hu
,
H.
,
2012
, “
An Experimental Investigation on the Trailing Edge Cooling of Turbine Blades
,”
Propul. Power Res.
,
1
(
1
), pp.
36
47
.
21.
Ledezma
,
G. A.
,
Lachance
,
J.
,
Wang
,
G.-H.
,
Wang
,
A. Q.
, and
Laskowski
,
G.
,
2016
, “
Experimental and Numerical Investigations of Round Multi-Hole Film Cooling: Part 2—Numerical Results
,”
ASME
Paper No. GT2016-56400.
22.
Wang
,
G.-H.
,
Estevadeordal
,
J.
,
DeLancey
,
J.
,
Bailey
,
J.
,
Kopriva
,
J.
, and
Laskowski
,
G.
,
2015
, “
Experimental and Numerical Investigations of the Heat Transfer and Flow Field in a Trailing Edge Cooling Geometry: Part 1—Experimental Study With IR Thermography and PIV
,”
ASME
Paper No. GT2015-43841.
23.
Liu
,
T.
, and
Sullivan
,
J. P.
,
2005
,
Pressure and Temperature Sensitive Paints
,
Springer-Verlag, Berlin
.
24.
Han
,
J.-C.
, and
Rallabandi
,
A. P.
,
2010
, “
Turbine Blade Film Cooling Using PSP Technique
,”
Front. Heat Mass Transfer
,
1
(
1
), p.
013001
.
25.
ISSI
,
2015
, “
Binary Pressure Sensitive Paint
,” Innovative Scientific Solutions, Inc., Dayton, OH, http://www.psp-tsp.com/
26.
ASME
,
2013
, “
Test Uncertainty, Performance Test Codes
,” The American Society of Mechanical Engineers, New York,
Standard No. PTC 19.1-2013
.
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