Heat (mass) transfer experiments are conducted to study the effect of an inlet skew on a simulated gas-turbine blade placed in a linear cascade. The inlet skew simulates the relative motion between rotor and stator endwalls in a single turbine stage. The transverse motion of a belt, placed parallel to and upstream of the turbine cascade, generates the inlet skew. With the freestream velocity constant at approximately 16 m/s, which results in a Reynolds number (based on the blade chord length of 0.184 m) of 1.8 × 105, a parametric study was conducted for three belt-to-freestream velocity ratios. The distribution of the Sherwood number on the suction surface of the blade shows that the inlet skew intensifies the generation of the horseshoe vortex close to the endwall region. This is associated with the development of a stronger passage vortex for a higher velocity ratio, which causes an earlier transition to turbulence. Corresponding higher mass transfer coefficients are measured between the midheight of the blade and the endwall, at a midchord downstream location. However, a negligible variation in transport properties is measured above the two-dimensional region of the blade at the higher velocity ratios. In contrast, the inlet skew has a negligible effect on the distribution of the Sherwood number on the entire pressure surface of the blade. This is mainly because the skew is directed along the passage vortex, which is from the pressure surface of the airfoil to the suction surface of the adjacent airfoil.

References

References
1.
Wang
,
H.
,
Olson
,
S.
,
Goldstein
,
R.
, and
Eckert
,
E.
, 1997, “
Flow Visualization in a Linear Turbine Cascade of High Performance Turbine Blades
,”
ASME J. Turbomach.
,
119
, p.
1
.
2.
Carrick
,
H. B.
, 1977, “
Secondary Flow and Losses in Turbine Cascades With Inlet Skew
,”
AGARD Conf. Proc., No. 214
, p.
9
.
3.
Bindon
,
J.
, 1979, “
Effect of Hub Inlet Boundary Layer Skewing on the Endwall Shear Flow in an Annular Turbine Cascade
,”
ASME Paper No. 79-GT-13
.
4.
Bindon
,
J.
, 1980, “
Exit Plane and Suction Surface Flows in an Annular Turbine Cascade With a Skewed Inlet Boundary Layer
,”
Int. J. Heat Fluid Flow
,
2
, p.
57
.
5.
Walsh
,
J.
, and
Gregory-Smith
,
D.
, 1990, “
Inlet Skew and the Growth of Secondary Losses and Vorticity in a Turbine Cascade
,”
ASME J. Turbomach.
,
112
, p.
633
.
6.
Walsh
,
J.
, and
Gregory-Smith
,
D.
, 1987, “
Effect of Inlet Skew on the Secondary Flows and Losses in a Turbine Cascade
,”
I Mech E Conf. Publ.
, p.
15
.
7.
Dullenkopf
,
K.
,
Schulz
,
A.
, and
Wittig
,
S.
, 1991, “
The Effect of Incident Wake Conditions on the Mean Heat Transfer of an Airfoil
,”
ASME J. Turbomach.
,
113
(
3
), p.
412
.
8.
Boletis
,
E.
, and
Sieverding
,
C.
, 1991, “
Experimental Study of the Three-Dimensional Flow Field in a Turbine Stator Preceded by a Full Stage
,”
ASME J. Turbomach.
,
113
(
1
), p.
1
.
9.
Zhang
,
L.
, and
Han
,
J.-C.
, 1995, “
Combined Effect of Free-Stream Turbulence and Unsteady Wake on Heat Transfer Coefficients From a Gas Turbine Blade
,”
ASME J. Heat Transfer
,
117
(
2
), p.
296
.
10.
Chaluvadi
,
V.
,
Kalfas
,
A.
,
Banieghbal
,
M.
,
Hodson
,
H.
, and
Denton
,
J.
, 2001, “
Blade-Row Interaction in a High-Pressure Turbine
,”
J. Propulsion Power
,
17
(
4
), p.
892
.
11.
Schlienger
,
J.
,
Kalfas
,
A.
, and
Abhari
,
R.
, 2005, “
Vortex-Wake-Blade Interaction in a Shrouded Axial Turbine
,”
ASME J. Turbomach.
,
127
(
4
), p.
699
.
12.
Schobeiri
,
M.
,
Ozturk
,
B.
, and
Ashpis
,
D.
, 2005, “
On the Physics of Flow Separation Along a Low Pressure Turbine Blade Under Unsteady Flow Conditions
,”
ASME J. Fluids Eng.
,
127
(
3
), p.
503
.
13.
Schobeiri
,
M.
,
Ozturk
,
B.
, and
Ashpis
,
D.
, 2007, “
Effect of Reynolds Number and Periodic Unsteady Wake Flow Condition on Boundary Layer Development, Separation, and Intermittency Behavior Along the Suction Surface of a Low Pressure Turbine Blade
,”
ASME J. Turbomach.
,
129
(
1
), p.
92
.
14.
Allan
,
W.
,
Ainsworth
,
R.
, and
Thorpe
,
S.
, 2008, “
Unsteady Heat Transfer Measurements From Transonic Turbine Blades at Engine Representative Conditions in a Transient Facility
,”
ASME J. Eng. Gas Turbines Power
,
130
, p.
041901
.
15.
Olson
,
S.
, 1999, “
Effects of High Turbulence and Wakes on Mass Transfer From Gas Turbine Blades
,” Ph.D. thesis, University of Minnesota.
16.
Srinivasan
,
V.
, and
Goldstein
,
R.
, 2003, “
Effect of Endwall Motion on Blade Tip Heat Transfer
,”
ASME J. Turbomach.
,
125
(
2
), p.
267
.
17.
Ghosh
,
K.
, and
Goldstein
,
R.
, 2009, “
Effect of Upstream Shear on Flow and Heat (Mass) Transfer Over a Flat Plate
,”
ASME Int. Mech. Eng. Congr. Exposition, Proc.
,
10
, p.
519
.
18.
Han
,
S.
, 2004, “
The Heat and Mass Transfer Analogy Factor, Nu/Sh for 2-D and 3-D Boundary Layers
,” Ph.D. thesis, University of Minnesota.
19.
Papa
,
M.
, 2006, “
Influence of Blade Leading Edge Geometry and Upstream Blowing on the Heat/Mass Transfer in a Turbine Cascade
,” Ph.D. thesis, University of Minnesota.
20.
Schmidt
,
E.
, 1929, “
Verdunstung und Warmeugergang
,”
Gesundheits-Ingenieur
,
29
, p.
525
.
21.
Nusselt
,
W.
, 1930, “
Warmeubergang, Diffusion und Verdunstung
,”
Math. Mechanik
,
2
, p.
105
.
22.
Goldstein
,
R.
, and
Cho
,
H.
, 1995, “
A Review of Mass Transfer Measurements Using Naphthalene Sublimation
,”
Exp. Thermal Fluid Sci.
,
10
(
4
), p.
416
.
23.
Eckert
,
E.
,
Sakamoto
,
H.
, and
Simon
,
T.
, 2001, “
The Heat/Mass Transfer Analogy Factor, Nu/Sh, for Boundary Layers on Turbine Blade Profiles
,”
Int. J. Heat Mass Transfer
,
44
, p.
1223
.
24.
Kline
,
S.
, and
McClintock
,
F.
, 1953, “
Describing Uncertainties in Single Sample Experiments
,”
Mech. Eng.
,
75
, p.
3
.
25.
Cho
,
K.
, 1989, “
Measurement of the Diffusion Coefficient of Naphthalene Into Air
,” Ph.D. thesis, State Univ. New York at Stony Brook.
26.
Chen
,
P.
, and
Wung
,
P.
, 1990, “
Diffusion Coefficient of Naphthalene in Air at Room Temperature
,” personal communication.
27.
Menter
,
F.
, 1994, “
Two-Equation Eddy-Viscosity Turbulence Models for Engineering Applications
,”
AIAA J.
,
32
, p.
1598
.
28.
Ameri
,
A.
, and
Bunker
,
R.
, 2000, “
Heat Transfer and Flow on the First-Stage Blade Tip of a Power Generation Gas Turbine: Part 2—Simulation Results
,”
ASME J. Turbomach.
,
122
(
2
), p.
272
.
29.
Garg
,
V.
, and
Ameri
,
A.
, 2001, “
Two-Equation Turbulence Models for Prediction of Heat Transfer on a Transonic Turbine Blade
,”
Int. J. Heat Fluid Flow
,
22
, p.
593
.
30.
Shih
,
T.-P.
, and
Lin
,
Y.-L.
, 2003, “
Controlling Secondary-Flow Structure by Leading-Edge Airfoil Fillet and Inlet Swirl to Reduce Aerodynamic Loss and Surface Heat Transfer
,”
ASME J. Turbomach.
,
125
, p.
48
.
31.
Mumic
,
F.
,
Ljungkruna
,
L.
, and
Sunden
,
B.
, 2006, “
Numerical Simulations of Heat Transfer and Fluid Flow for a Rotating High-Pressure Turbine
,”
Proc. ASME Turbo Expo 2006
,
6
, p.
1149
.
32.
Papa
,
M.
,
Goldstein
,
R.
, and
Gori
,
F.
, 2007, “
Numerical Heat Transfer Predictions and Mass/Heat Transfer Measurements in a Linear Turbine Cascade
,”
Appl. Thermal Eng.
,
27
(
4
), p.
771
.
33.
Goldstein
,
R.
,
Wang
,
H.
, and
Jabbari
,
M.
, 1995, “
The Influence of Secondary Flows Near the Endwall and Boundary Layer Disturbance on Convective Transport From a Turbine Blade
,”
ASME J. Turbomach.
,
117
, p.
657
.
34.
Sparrow
,
E.
,
Quack
,
H.
, and
Boerner
,
C.
, 1970, “
Local Non-Similarity Boundary-Layer Solutions
,”
AIAA J.
,
8
, p.
1936
.
35.
Sonoda
,
T.
, 1985, “
Experimental Investigation on Special Development of Streamwise Vortices in a Turbine Inlet Guide Vane Cascade
,”
ASME Paper No. 85-GT-20
.
36.
Doorly
,
D.
, and
Oldfield
,
M.
, 1985, “
Simulation of Wake Passing in a Stationary Turbine Rotor Cascade
,”
J. Propul. Power
,
1
, p.
316
.
37.
Wang
,
H.
,
Olson
,
S.
, and
Goldstein
,
R.
, 2005, “
Development of Taylor-Gortler Vortices Over the Pressure Surface of a Turbine Blade
,”
ASME J. Heat Transfer
,
127
(
5
), p.
540
.
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