Abstract

With the advent of the use of additive manufacturing to build gas turbine components, the design space for new hole geometries is essentially unlimited. Recently, a computational adjoint-based optimization method was used to design shaped film cooling holes fed by internal co-flow and cross-flow channels. The associated Reynolds-averaged Navier–Stokes computations predicted that the holes optimized for use with cross-flow (X-AOpt) and co-flow (Co-AOpt) would significantly increase adiabatic effectiveness. However, only the X-AOpt hole was tested experimentally in this previous study. Though the experimentally measured performance for this hole was much less than computationally predicted, it still had a 75% improved performance compared to the conventional 7-7-7-shaped hole. In the current study, the X-AOpt and Co-AOpt-shaped holes were experimentally evaluated using measurements of adiabatic effectiveness and overall cooling effectiveness. Coolant was fed to the holes with an internal co-flow channel. For reference, experiments were also conducted with the baseline 7-7-7-shaped hole, and a 15-15-1-shaped hole (shown in a previous study to be the optimum expansion angles for a shaped hole). Furthermore, overall cooling effectiveness measurements were made with engine-scale models to evaluate the performance of additively manufactured (AM) X-AOpt and Co-AOpt holes with a realistic metal build. Results from this study confirmed that the X-AOpt hole had a 75% increase in adiabatic effectiveness compared to the 7-7-7-shaped hole. However, the Co-AOpt hole had only a 30% increase in adiabatic effectiveness, substantially less than had been computationally predicted. Measurements of overall cooling effectiveness for the engine-scale models and the large-scale models followed similar trends.

References

1.
Schurb
,
J.
,
Hoebel
,
M.
,
Haehnle
,
H.
,
Kissel
,
H.
,
Bogdanic
,
L.
, and
Etter
,
T.
,
2016
, “
Additive Manufacturing of Hot Gas Path Parts and Engine Validation in a Heavy Duty GT
,”
Volume 6: Ceramics; Controls, Diagnostics and Instrumentation; Education; Manufacturing Materials and Metallurgy
,
Seoul, South Korea
,
June 13–17
,
American Society of Mechanical Engineers
, p.
V006T21A005
.
2.
Min
,
Z.
,
Huang
,
G.
,
Parbat
,
S. N.
,
Yang
,
L.
, and
Chyu
,
M. K.
,
2019
, “
Experimental Investigation on Additively Manufactured Transpiration and Film Cooling Structures
,”
ASME J. Turbomach.
,
141
(
3
), p.
031009
.
3.
Stimpson
,
C. K.
,
Snyder
,
J. C.
,
Thole
,
K. A.
, and
Mongillo
,
D.
,
2018
, “
Effectiveness Measurements of Additively Manufactured Film Cooling Holes
,”
ASME J. Turbomach.
,
140
(
1
), p.
011009
.
4.
Snyder
,
J. C.
, and
Thole
,
K. A.
,
2020
, “
Effect of Additive Manufacturing Process Parameters on Turbine Cooling
,”
ASME J. Turbomach.
,
142
(
5
), p.
051007
.
5.
Snyder
,
J. C.
, and
Thole
,
K. A.
,
2020
, “
Performance of Public Film Cooling Geometries Produced Through Additive Manufacturing
,”
ASME J. Turbomach.
,
142
(
5
), p.
051009
.
6.
Fraas
,
M.
,
Glasenapp
,
T.
,
Schulz
,
A.
, and
Bauer
,
H.-J.
,
2019
, “
Optimized Inlet Geometry of a Laid- Back Fan-Shaped Film Cooling Hole–Experimental Study of Film Cooling Performance
,”
Int. J. Heat Mass Transfer
,
128
, pp.
980
990
.
7.
Jones
,
F. B.
,
Fox
,
D. W.
, and
Bogard
,
D. G.
,
2020
, “Experimental and Computational Investigation of Shaped Film Cooling Holes Designed to Minimize Inlet Separation,
ASME Turbo Expo 2020
,
Virtual, Online
,
Sept. 21–25
,
American Society of Mechanical Engineers
,
New York
.
8.
Jones
,
F. B.
,
Fox
,
D. W.
,
Oliver
,
T.
, and
Bogard
,
D. G.
,
2021
, “
Parametric Optimization of Film Cooling Hole Geometry
,”
Volume 5A: Heat Transfer—Combustors; Film Cooling
,
Virtual, Online
,
June 7–11
,
American Society of Mechanical Engineers
, p.
V05AT12A013
.
9.
Dyson
,
T. E.
,
McClintic
,
J. W.
,
Bogard
,
D. G.
, and
Bradshaw
,
S. D.
,
2013
, “
Adiabatic and Overall Effectiveness for a Fully Cooled Turbine Vane
,”
Volume 3B: Heat Transfer
,
San Antonio, TX
,
June 3–7
,
American Society of Mechanical Engineers
, p.
V03BT13A037
.
10.
Anderson
,
J. B.
,
Boyd
,
E. J.
, and
Bogard
,
D. G.
,
2015
, “
Experimental Investigation of Coolant-to-Mainstream Scaling Parameters With Cylindrical and Shaped Film Cooling Holes
,”
Volume 5B: Heat Transfer
,
Montreal, Quebec, Canada
,
June 15–19
,
American Society of Mechanical Engineers
, p.
V05BT12A033
.
11.
Yoon
,
C.
,
Gutierrez
,
D.
,
Furgeson
,
M. T.
, and
Bogard
,
D. G.
,
2022
, “
Evaluation of Adjoint Optimized Hole—Part II: Parameter Effects on Performance
,”
Proceedings of ASME Turbo Expo 2022
,
American Society of Mechanical Engineers
,
Rotterdam, The Netherlands
. ASME Paper No. GT2022-82726.
12.
Veley
,
E. M.
,
Furgeson
,
M. T.
,
Thole
,
K. A.
, and
Bogard
,
D. G.
,
2022
, “
Printability and Overall Cooling Performance of Additively Manufacturing Holes With Inlet and Exit Rounding
,”
Proceedings of ASME Turbo Expo 2022
.
American Society of Mechanical Engineers
,
Rotterdam, The Netherlands
, ASME Paper No. GT2022-83313.
13.
Gritsch
,
M.
,
Colban
,
W.
, and
Dobbeling
,
K.
,
2005
, “
Effect of Hole Geometry on the Thermal Performance of Fan-Shaped Film Cooling Holes
,”
ASME J. Turbomach.
,
127
(
4
), pp.
718
725
.
14.
Jones
,
F. B.
,
Oliver
,
T.
, and
Bogard
,
D. G.
,
2021
, “
Adjoint Optimization of Film Cooling Hole Geometry
,”
Volume 5A: Heat Transfer—Combustors; Film Cooling
,
Virtual online
,
June 7–11
,
American Society of Mechanical Engineers
, p.
V05AT12A014
.
15.
Furgeson
,
M. T.
,
Veley
,
E. M.
,
Yoon
,
C.
,
Gutierrez
,
D.
,
Bogard
,
D. G.
, and
Thole
,
K. A.
,
2022
, “
Development and Evaluation of Shaped Film Cooling Holes Designed for Additive Manufacturing
,”
Proceedings of ASME Turbo Expo 2022
,
American Society of Mechanical Engineers
,
Rotterdam, The Netherlands
. ASME Paper No. GT2022-83201.
16.
Fox
,
D. W.
,
Jones
,
F. B.
,
Mc Clintic
,
J. W.
,
Bogard
,
D. G.
,
Dyson
,
T. E.
, and
Webster
,
Z. D.
,
2019
, “
Rib Turbulator Effects on Crossflow-Fed Shaped Film Cooling Holes
,”
ASME J. Turbomach.
,
141
(
3
), p.
031013
.
17.
Moffat
,
R. J.
,
1988
, “
Describing the Uncertainties in Experimental Results
,”
Exp. Therm. Fluid. Sci.
,
1
(
1
), pp.
3
17
.
18.
Gritsch
,
M.
,
Saumweber
,
C.
,
Schulz
,
A.
,
Wittig
,
S.
, and
Sharp
,
E.
,
2000
, “
Effect of Internal Coolant Crossflow Orientation on the Discharge Coefficient of Shaped Film-Cooling Holes
,”
ASME J. Turbomach.
,
122
(
1
), pp.
146
152
.
19.
Gritsch
,
M.
,
Schulz
,
A.
, and
Wittig
,
S.
,
1997
, “
Discharge Coefficient Measurements of Film-Cooling Holes With Expanded Exits
,”
ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration
,
Orlando, FL
,
June 2–5
,
American Society of Mechanical Engineers
, p.
V003T09A030
.
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