The convective heat transfer distribution in a rib-roughened rotating internal cooling channel was measured for different rotation and Reynolds numbers, representative of engine operating conditions. The test section consisted of a channel of aspect ratio equal to 0.9 with one wall equipped with eight ribs perpendicular to the main flow direction. The pitch to rib height ratio was 10 and the rib blockage was 10%. The test rig was designed to provide a uniform heat flux boundary condition over the ribbed wall, minimizing the heat transfer losses and allowing temperature measurements at significant rotation rates. Steady-state liquid crystal thermography (LCT) was employed to quantify a detailed 2D distribution of the wall temperature, allowing the determination of the convective heat transfer coefficient along the area between the sixth and eighth rib. The channel and all the required instrumentation were mounted on a large rotating disk, providing the same spatial resolution and measurement accuracy as in a stationary rig. The assembly was able to rotate both in clockwise and counterclockwise directions, so that the investigated wall was acting either as leading or trailing side, respectively. The tested Reynolds number values (based on the hydraulic diameter of the channel) were 15,000, 20,000, 30,000, and 40,000. The maximum rotation number values were ranging between 0.12 (Re = 40,000) and 0.30 (Re = 15,000). Turbulence profiles and secondary flows modified by rotation have shown their impact not only on the average value of the heat transfer coefficient but also on its distribution. On the trailing side, the heat transfer distribution flattens as the rotation number increases, while its averaged value increases due to the turbulence enhancement and secondary flows induced by the rotation. On the leading side, the secondary flows counteract the turbulence reduction and the overall heat transfer coefficient exhibits a limited decrease. In the latter case, the secondary flows are responsible for high heat transfer gradients on the investigated area.

References

References
1.
Han
,
J.-C.
,
Dutta
,
S.
, and
Ekkad
,
S. V.
,
2010
,
Gas Turbine Heat Transfer and Cooling Technology
,
2nd ed.
,
Taylor & Francis
,
London
.
2.
Ligrani
,
P.
,
2013
, “
Heat Transfer Augmentation Technologies for Internal Cooling of Turbine Components of Gas Turbine Engines
,”
Int. J. Rotating Mach.
,
2013
, p.
275653
.10.1155/2013/275653
3.
Johnston
,
J. P.
,
1998
, “
Effects of System Rotation on Turbulence Structure: A Review Relevant to Turbomachinery Flows
,”
Int. J. Rotating Mach.
,
4
(
2
), pp.
97
112
.10.1155/S1023621X98000098
4.
Bons
,
J. P.
, and
Kerrebrock
,
J. L.
,
1999
, “
Complementary Velocity and Heat Transfer Measurements in a Rotating Cooling Passage With Smooth Walls
,”
ASME J. Turbomach.
,
121
(
4
), pp.
651
662
.10.1115/1.2836717
5.
Coletti
,
F.
,
Maurer
,
T.
,
Arts
,
T.
, and
Di Sante
,
A.
,
2012
, “
Flow Field Investigation in Rotating Rib-Roughened Channel by Means of Particle Image Velocimetry
,”
Exp. Fluids
,
52
(
4
), pp.
1043
1061
.10.1007/s00348-011-1191-2
6.
Taslim
,
M. E.
,
Rahman
,
A.
, and
Spring
,
S. D.
,
1991
, “
An Experimental Investigation of Heat Transfer Coefficients in a Spanwise Rotating Channel With Two Opposite Rib-Roughened Walls
,”
ASME J. Turbomach.
,
113
(
1
), pp.
75
82
.10.1115/1.2927740
7.
El-Husayni
,
H. A.
,
Taslim
,
M. E.
, and
Kercher
,
D. M.
,
1994
, “
Experimental Heat Transfer Investigation of Stationary and Orthogonally Rotating Asymmetric and Symmetric Heated Smooth and Turbulated Channels
,”
ASME J. Turbomach.
,
116
(
1
), pp.
124
132
.10.1115/1.2928266
8.
Iacovides
,
H.
,
Jackson
,
D. C.
,
Kelemenis
,
G.
,
Launder
,
B. E.
, and
Yuan
,
Y. M.
,
2001
, “
Flow and Heat Transfer in a Rotating U-Bend With 45° Ribs
,”
Int. J. Heat Fluid Flow
,
22
(
3
), pp.
308
314
.10.1016/S0142-727X(01)00093-5
9.
Liou
,
T.-M.
,
Chen
,
M.-Y.
, and
Tsai
,
M.-H.
,
2001
, “
Fluid Flow and Heat Transfer in a Rotating Two-Pass Square Duct With In-Line 90° Ribs
,”
ASME
Paper No. 2001-GT-0185.10.1115/2001-GT-0185
10.
Andrei
,
L.
,
Andreini
,
A.
,
Bonanni
,
L.
, and
Facchini
,
B.
,
2012
, “
Heat Transfer in Internal Channel of a Blade: Effects of Rotation in a Trailing Edge Cooling System
,”
J. Therm. Sci.
,
21
(
3
), pp.
236
249
.10.1007/s11630-012-0541-6
11.
Gallo
,
M.
,
Astarita
,
T.
, and
Carlomagno
,
G. M.
,
2007
, “
Heat Transfer Measurements in a Rotating Two-Pass Square Channel
,”
Quant. Infrared Thermogr. J.
,
4
(
1
), pp.
41
62
.10.3166/qirt.4.41-62
12.
Chang
,
S. W.
,
Liou
,
T.-M.
, and
Lee
,
T.-H.
,
2012
, “
Thermal Performance of Developing Flow in a Radially Rotating Parallelogram Channel With 45° Ribs
,”
Int. J. Therm. Sci.
,
52
, pp.
186
204
.10.1016/j.ijthermalsci.2011.09.013
13.
Chen
,
H. C.
,
Jang
,
Y. J.
, and
Han
,
J. C.
,
2000
, “
Computation of Heat Transfer in Rotating Two-Pass Square Channels by a Second-Moment Closure Model
,”
Int. J. Heat Mass Transfer
,
43
(
9
), pp.
1603
1616
.10.1016/S0017-9310(99)00227-6
14.
Sleiti
,
A. K.
, and
Kapat
,
J. S.
,
2008
, “
Effect of Coriolis and Centrifugal Forces on Turbulence and Transport at High Rotation and Density Rations in a Rib-Roughened Channel
,”
Int. J. Therm. Sci.
,
47
(
2008
), pp.
609
619
.10.1016/j.ijthermalsci.2007.06.008
15.
Saha
,
A. K.
, and
Acharya
,
S.
,
2005
, “
Unsteady RANS Simulation of Turbulent Flow and Heat Transfer in Ribbed Coolant Passages of Different Aspect Ratios
,”
Int. J. Heat Mass Transfer
,
48
(
23–24
), pp.
4704
4725
.10.1016/j.ijheatmasstransfer.2005.05.030
16.
Murata
,
A.
, and
Mochizuki
,
S.
,
2000
, “
Large Eddy Simulation With A Dynamic Subgrid-Scale Model of Turbulent Heat Transfer in an Orthogonally Rotating Rectangular Duct With Transverse Rib Turbulators
,”
Int. J. Heat Mass Transfer
,
43
(
7
), pp.
1243
1259
.10.1016/S0017-9310(99)00205-7
17.
Murata
,
A.
, and
Mochizuki
,
S.
,
2004
, “
Aiding and Opposing Contributions of Centrifugal Buoyancy on Turbulent Heat Transfer in a Two-Pass Transverse- or Angled-Rib-Roughened Channel With Sharp 180° Turns
,”
Int. J. Heat Mass Transfer
,
47
(
17,18
), pp.
3721
3743
.10.1016/j.ijheatmasstransfer.2004.03.025
18.
Sewal
,
E. A.
, and
Tafti
,
D. K.
,
2007
, “
Large Eddy Simulation of Flow and Heat Transfer in the Developing Flow Region of a Rotating Gas Turbine Blade Internal Cooling Duct With Coriolis and Buoyancy Forces
,”
ASME J. Turbomach.
,
130
(
1
), p.
011005
.10.1115/1.2437779
19.
Fransen
,
R.
,
2013
, “
LES Based Aerothermal Modeling of Turbine Blade Cooling Systems
,” Ph.D. thesis, CERFACS, Universite de Toulouse, Toulouse, France.
20.
Narasimhamurthy
,
V. D.
, and
Andersson
,
H. I.
,
2011
, “
DNS of Turbulent Flow in a Rotating Rough Channel
,”
Direct and Large-Eddy Simulation VIII
, (Ercoftac Series, Vol. 15),
Springer
,
Amsterdam
, pp.
413
418
.
21.
Han
,
J. C.
,
Zhang
,
Y. M.
, and
Kalkuehler
,
K.
,
1993
, “
Uneven Wall Temperature Effect on Local Heat Transfer in a Rotating Two-Pass Square Channel With Smooth Walls
,”
ASME J. Turbomach.
,
115
(
4
), pp.
912
920
.10.1115/1.2911387
22.
Rau
,
G.
,
Çakan
,
M.
,
Moeller
,
D.
, and
Arts
,
T.
,
1998
, “
The Effect of Periodic Ribs on the Local Aerodynamic and Heat Transfer Performance of a Straight Cooling Channel
,”
ASME J. Turbomach.
,
120
(
2
), pp.
368
375
.10.1115/1.2841415
23.
Han
,
J.-C.
, and
Zhang
,
Y.-M.
,
1992
, “
High Performance Heat Transfer Ducts With Parallel Broken and V-Shaped Broken Ribs
,”
Int. J. Heat Mass Transfer
,
35
(
2
), pp.
513
523
.10.1016/0017-9310(92)90286-2
24.
Di Sante
,
A.
,
Theunissen
,
R.
, and
Van den Braembussche
,
R. A.
,
2008
, “
A New Facility for Time-Resolved PIV Measurements in Rotating Channels
,”
Exp. Fluids
,
44
(
2
), pp.
179
188
.10.1007/s00348-007-0389-9
25.
Mayo
,
I.
,
Arts
,
T.
,
Clinckemaillie
,
J.
, and
Lahalle
,
A.
,
2013
, “
Spatially Resolved Heat Transfer Coefficient in a Rib-Roughened Channel Under Coriolis Effects
,”
ASME
Paper No. GT2013-94506.10.1115/GT2013-94506
26.
Johnson
,
B. V.
,
Wagner
,
J. H.
, and
Steuber
,
G. D.
,
1993
,
Effects of Rotation on Coolant Passage Heat Transfer
, Vol.
II
,
NASA
,
Washington, DC
.
27.
Coletti
,
F.
,
2011
, “
Coupled Flow Field and Heat Transfer in an Advanced Internal Cooling Scheme
,” Ph.D. thesis, Universitat Stuttgart/von Karman Institute For Fluid Dynamics, Stuttgart, Germany/Rhode-Saint-Genèse, Belgium.
28.
Cukurel
,
B.
,
Selcan
,
C.
, and
Arts
,
T.
,
2012
, “
Color Theory Perception of Steady Wide Band Liquid Crystal Thermometry
,”
Exp. Therm. Fluid Sci.
,
39
, pp.
112
122
.10.1016/j.expthermflusci.2012.01.015
29.
Kline
,
S. J.
, and
Mcclintock
,
F. A.
,
1953
, “
Describing Uncertainties in Single-Sample Experiments
,”
ASME J. Mech. Eng.
,
75
(1), pp.
3
8
.
30.
Çakan
,
M.
,
2000
, “
Aerothermal Investigation of Fixed Rib-Roughened Internal Cooling Passages
,” Ph.D. thesis Université Catholique de Louvain/von Karman Institute For Fluid Dynamics, Louvain-la-Neuve, Belgium/Rhode-Saint-Genèse, Belgium.
You do not currently have access to this content.