The current detailed experimental study focuses on the optimization of heat transfer performance through jet impingement by varying the coolant flow rate to each individual jet. The test section consists of an array of jets, each jet individually fed and metered separately, that expel coolant into the channel and exit through one end. The diameter D, height-to-diameter H/D, and jet spacing-to-diameter S/D are all held constant at 9.53 mm, 2, and 4, respectively. Upon defining the optimum flow rate for each jet, varying diameter jet plates are designed and tested using a similar test setup with the addition of a plenum. Two test cases are conducted by varying the jet diameter within 10% compared to the benchmark jet diameter, 9.53 mm. The Reynolds number, which is based on hydraulic diameter of the channel and total mass flow rate entering the channel, ranges from approximately 52,000 up to 78,000. The transient liquid crystal technique is employed in this study to determine the local and average heat transfer coefficient distributions on the target plate. Commercially available computational fluid dynamics software, ansys cfx, is used to qualitatively correlate the experimental results and to fully understand the flow field distributions within the channel. The results revealed that varying the jet flow rates, total flow varied by approximately ±5% from that of the baseline case, the heat transfer enhancement on the target surface is enhanced up to approximately 35%. However, when transitioning to the varying diameter jet plate, this significant enhancement is suppressed due to the nature of flow distribution from the plenum, combined with the complicated crossflow effects.

References

References
1.
Devore
,
M. A.
, and
Paauwe
,
C. S.
,
2009
, “
Turbine Airfoil With Improved Cooling
,” U.S. Patent No. 7,600,966, B2.
2.
Liang
,
G.
,
2010
, “
Blade for a Gas Turbine
,” U.S. Patent No. 7,819,629, B2.
3.
Campbell
,
C. X.
, and
Morrison
,
J. A.
,
2012
, “
Turbine Airfoil With a Compliant Outer Wall
,” U.S. Patent No. 8,147,196, B2.
4.
Liang
,
G.
,
2011
, “
Light Weight and Highly Cooled Turbine Blade
,” U.S. Patent No. 8,057,183, B1.
5.
Martin
,
H.
,
1979
, “
Heat and Mass Transfer Between Impinging Gas Jets and Solid Surfaces
,”
Advances in Heat Transfer
, Vol.
13
,
Academic Press
,
New York, NY
, pp.
1
60
.
6.
Livingood
,
J. N. B.
, and
Hrycak
,
P.
,
1973
, “
Impingement Heat Transfer From Turbulent Air Jets to Flat Plates—A Literature Survey
,” NASA, Lewis Research Center, Cleveland, OH,
NASA
Paper No. TM X-2778.
7.
Hollworth
,
B. R.
, and
Cole
,
G. H.
,
1987
, “
Heat Transfer to Arrays of Impinging Jets in a Crossflow
,”
ASME J. Turbomach.
,
109
(
4
), pp.
564
571
.
8.
Weigand
,
B.
, and
Spring
,
S.
,
2011
, “
Multiple Jet Impingement—A Review
,”
Heat Transfer Res.
,
42
(
2
), pp.
101
142
.
9.
Downs
,
S. J.
, and
James
,
E. H.
,
1987
, “
Jet Impingement Heat Transfer—A Literature Survey
,”
ASME
Paper No. 87-HT-35.
10.
Jambunathan
,
K.
, and
Button
,
B. L.
,
1994
, “
Jet-Impingement Heat Transfer: A Bibliography 1986–1991
,”
Previews Heat Mass Transfer
,
20
(
5
), pp.
385
413
.
11.
Han
,
B.
, and
Goldstein
,
R.
,
2000
, “
Jet-Impingement Heat Transfer in Gas Turbine Systems
,”
Ann. N. Y. Acad. Sci.
,
934
(
1
), pp.
147
161
.
12.
Goldstein
,
R.
, and
Seol
,
W.
,
1991
, “
Heat Transfer to a Row of Impinging Circular Air Jets Including the Effect of Entrainment
,”
Int. J. Heat Mass Transfer
,
34
(
8
), pp.
2133
2147
.
13.
Uysal
,
U.
,
Li
,
P.
,
Chyu
,
M. K.
, and
Cunha
,
F. J.
,
2006
, “
Heat Transfer on Internal Surfaces of a Duct Subjected to Impingement of a Jet Array With Varying Jet Hole-Size and Spacing
,”
ASME J. Turbomach.
,
128
(
1
), pp.
158
165
.
14.
Sping
,
S.
,
Xing
,
Y.
, and
Weigand
,
B.
,
2012
, “
An Experimental and Numerical Study of Heat Transfer From Arrays of Impinging Jets With Surface Ribs
,”
ASME J. Heat Transfer
,
134
(
8
), p.
082201
.
15.
Trabold
,
T. A.
, and
Obot
,
N. T.
,
1987
, “
Impingement Heat Transfer Within Arrays of Circular Jets—Part II: Effects of Crossflow in the Presence of Roughness Elements
,”
ASME
Paper No. 87-GT-200.
16.
Andrews
,
G.
,
Abdul Hussain
,
R.
, and
Mkpadi
,
M.
,
2003
, “
Enhanced Impingement Heat Transfer: Comparison of Co-Flow and Cross-Flow With Rib Turbulators
,” International Gas Turbine Congress (IGTC2003), Tokyo, Japan, Nov. 2–7, Paper No. TS-075.
17.
Annerfeldt
,
M.
,
Persson
,
L.
, and
Torisson
,
T.
,
2001
, “
Experimental Investigation of Impingement Cooling With Turbulators or Surface Enlarging Elements
,”
ASME
Paper No. 2001-GT-0149.
18.
Chang
,
H.
,
Zhang
,
D.
, and
Huang
,
T.
,
1997
, “
Impingement Heat Transfer From Rib Roughened Surface Within Arrays of Circular Jet: The Effect of the Relative Position of the Jet Hole to the Ribs
,”
ASME
Paper No. 97-GT-331.
19.
Chang
,
H.
,
Zhang
,
J.
, and
Huang
,
T.
,
1998
, “
Experimental Investigation on Impingement Heat Transfer From Rib Roughened Surface Within Arrays of Circular Jet: Effect of Geometric Parameters
,”
ASME
Paper No. 98-GT-208.
20.
Chang
,
H.
,
Zhang
,
J.
, and
Huang
,
T.
,
2000
, “
Experimental Investigation on Impingement Heat Transfer From Rib Roughened Surface Within Arrays of Circular Jets: Correlation
,”
ASME
Paper No. 2000-GT-0220.
21.
Ekkad
,
S. V.
,
Esposito
,
E. I.
, and
Kim
,
Y. W.
,
2012
, “
Zero-Cross-Flow Impingement Via an Array of Differing Length, Extended Ports
,” U.S. Patent No. U.S. 8,127,553 B2.
22.
Zu
,
Y. Q.
,
Yan
,
Y. Y.
, and
Maltson
,
J. D.
,
2009
, “
CFD Prediction for Multi-Jet Impingement Heat Transfer
,”
ASME
Paper No. GT2009-59488.
23.
Thielen
,
L.
,
Hanjalic
,
K.
,
Jonker
,
H.
, and
Manceau
,
R.
,
2005
, “
Predictions of Flow and Heat Transfer in Multiple Impinging Jet With an Elliptic-Blending Second-Moment Closure
,”
Int. J. Heat Mass Transfer
,
48
(
8
), pp.
1583
1598
.
24.
Rao
,
G. A.
,
Kitron-Belinkov
,
M.
, and
Levy
,
Y.
,
2009
, “
Numerical Analysis of a Multiple Jet Impingement System
,”
ASME
Paper No. GT2009-59719.
25.
Bunker
,
R. S.
, and
Wallace
,
T. T.
,
1994
, “
Turbine Airfoil With Double Shell Outer Wall
,” U.S. Patent No. 5,328,331.
26.
Sellers
,
R. R.
,
Soechting
,
F. O.
,
Huber
,
F. W.
, and
Auxier
,
T. A.
,
1998
, “
Cooled Blades for a Gas Turbine Enginer
,” U.S. Patent No. 5,720,431.
27.
Bunker
,
R. S.
,
2013
, “
Gas Turbine Cooling: Moving From Macro to Micro Cooling
,”
ASME
Paper No. GT2013-94277.
28.
Kline
,
S. J.
, and
McClintock
,
F. A.
,
1953
, “
Describing Uncertainties in Single Sample Experiments
,”
ASME Mech. Eng. (Am. Soc. Mech. Eng.)
,
75
, pp.
3
8
.
29.
Ireland
,
P. T.
, and
Jones
,
T. V.
,
1985
, “
The Measurement of Local Heat Transfer Coefficients in Blade Cooling Geometries
,”
AGARD Conference on Heat Transfer and Cooling in Gas Turbines, CP 390, Bergen, Norway
, May 6–10, Paper No. 28.
30.
Baugh
,
J. W.
,
Ireland
,
P. T.
,
Jones
,
T. V.
, and
Saniei
,
N.
,
1989
, “
A Comparison on the Transient and Heated-Coating Methods for the Measurement of Local Heat Transfer Coefficients on a Pin-Fin
,”
ASME J. Heat Transfer
,
111
(
4
), pp.
877
881
.
31.
Critoph
,
R. E.
, and
Fisher
,
M.
,
1998
, “
A Study of Local Heat Transfer Coefficients in Plate Fin-Tube Heat Exchangers Using the Steady State and Transient Liquid Crystal Techniques
,” International Conference on Optical Methods and Data Processing in Heat and Fluid Flow, London, UK, Apr. 16–17, Vol. 2, pp.
201
210
.
32.
Yen
,
C. H.
,
1999
, “
An Experimental Study of Heat Transfer Around Turbine Airfoils With Closed-Loop Cooling
,” Ph.D. dissertation, Carnegie Mellon University, Pittsburgh, PA.
33.
Chen
,
S. P.
,
Li
,
P. W.
, and
Chyu
,
M. K.
,
2006
, “
Heat Transfer in a Airfoil Trailing Edge Configuration With Shaped Pedestals Mounted Internal Cooling Channel and Pressure Side Cutback
,”
ASME
Paper No. GT2006-91019.
34.
Chyu
,
M. K.
,
Ding
,
H.
,
Downs
,
J. P.
, and
Soechting
,
F. O.
,
1998
, “
Determination of Local Heat Transfer Coefficient Based on Bulk Mean Temperature Using a Transient Liquid Crystal Techniques
,”
Exp. Therm. Fluid Sci.
,
18
(
2
), pp.
142
149
.
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