An experimental research program was undertaken to examine the influence of large-scale high-intensity turbulence on vane exit losses, wake growth, and exit turbulence characteristics. The experiment was conducted in a four-vane linear cascade at an exit Reynolds number of 800,000 based on chord length and an exit Mach number of 0.27. Exit measurements were made for four inlet turbulence conditions including a low-turbulence case (Tu ≈ 1 percent), a grid-generated turbulence case (Tu ≈ 7.5. percent) and two levels of large-scale turbulence generated with a mock combustor (Tu ≈ 12 and 8 percent). Exit total pressure surveys were taken at two locations to quantify total pressure losses. The suction surface boundary layer was also traversed to determine losses due to boundary layer growth. Losses occurred in the core of the flow for the elevated turbulence cases. The elevated free-stream turbulence was found to have a significant effect on wake growth. Generally, the wakes subjected to elevated free-stream turbulence were broader and had smaller peak velocity deficits. Reynolds stress profiles exhibited asymmetry in peak amplitudes about the wake centerline, which are attributable to differences in the evolution of the boundary layers on the pressure and suction surfaces of the vanes. The overall level of turbulence and dissipation inside the wakes and in the free stream was determined to document the rotor inlet boundary conditions. This is useful information for assessing rotor heat transfer and aerodynamics. Eddy diffusivities and mixing lengths were estimated using X-wire measurements of turbulent shear stress. The free-stream turbulence was found to strongly affect eddy diffusivities, and thus wake mixing. At the last measuring position, the average eddy diffusivity in the wake of the high-turbulence close combustor configuration (Tu ≈ 12) was three times that of the low turbulence wake.

Issue Section:
Research Papers
Topics:
Turbulence, Wakes, Boundary layers, Eddies (Fluid dynamics), Pressure, Combustion chambers, Rotors, Suction, Aerodynamics, Boundary-value problems, Cascades (Fluid dynamics), Chords (Trusses), Energy dissipation, Flow (Dynamics), Heat transfer, Mach number, Reynolds number, Shear stress, Stress, Wire
1.
Ames, F. E., and Moffat, R. J., 1990, “Heat Transfer With High Intensity, Large Scale Turbulence: The Flat Plate Turbulent Boundary Layer and the Cylindrical Stagnation Point,” Report No. HMT-43, Thermosciences Division of Mechanical Engineering, Stanford University.
2.
Ames, F. E., 1994, “Experimental Study of Vane Heat Transfer and Aerodynamics at Elevated Levels of Turbulence,” NASA CR 4633.
3.
Ames
F. E.
,
1997
, “
The Effects of Large-Scale, High Intensity Turbulence on Vane Heat Transfer
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
119
, p.
23
23
.
4.
Arts, T., Lambert de Rouvroit, M., and Rutherford, A. W., 1990, “Aero-thermal Investigation of a Highly Loaded Transonic Linear Turbine Guide Vane Cascade,” Technical Note 174, von Karman Institute for Fluid Dynamics, Belgium.
5.
Bicen
A. F.
, and
Jones
W. P.
,
1986
, “
Velocity Characteristics of Isothermal and Combusting Flows in a Model Combustor
,”
Combust. Sci. and Technology
, Vol.
49
, p.
1
1
.
6.
Denton
J. D.
,
1993
, “
Loss Mechanisms in Turbomachines
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
115
, pp.
621
–
656
.
7.
Dullenkopf
K.
,
Schulz
A.
, and
Wittig
S.
,
1991
, “
The Effect of Incident Wake Conditions on the Mean Heat Transfer of an Airfoil
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
113
, pp.
412
–
418
.
8.
Dullenkopf
K.
, and
Mayle
R. E.
,
1994
, “
The Effects of Incident Turbulence and Moving Wakes on Laminar Heat Transfer in Gas Turbines
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
116
, p.
23
23
.
9.
Frota, M. F., 1982, “Analysis of the Uncertainties in Velocity Measurements and Technique for Turbulence Measurements in Complex Heated Flows With Multiple Hot-Wires,” Ph.D. Dissertation, Dept. Mech. Engr., Stanford University.
10.
Glassman, A. J., ed., 1973, Turbine Design and Application, Vols. 1–3, NASA SP-290.
11.
Gregory-Smith
D. G.
, and
Cleak
J. G. E.
,
1992
, “
Secondary Flow Measurements in a Turbine Cascade With High Inlet Turbulence
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
114
, p.
173
173
.
12.
Hancock
P. E.
, and
Bradshaw
P.
1983
, “
The Effect of Free-Stream Turbulence on Turbulent Boundary Layers
,”
ASME Journal of Fluids Engineering
, Vol.
105
, p.
284
284
.
13.
Hinze, J., 1975, Turbulence, 2nd ed., McGraw-Hill, New York.
14.
Hoheisel
H.
,
Kiock
R.
,
Lichtfuss
H. J.
, and
Fottner
L.
,
1987
, “
Influence of Free-Stream Turbulence and Blade Pressure Gradient on Boundary Layer and Loss Behavior of Turbine Cascades
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
109
, p.
210
210
.
15.
Hoffmann, J. A., and Kassir, S. M., 1989, “Effects of Free Stream Turbulence on Turbulent Boundary Layers With Mild Adverse Pressure Gradients,” AIAA Paper No. 88-3757-CP.
16.
Kline, S. J., and McClintock, F. A., Jan., 1953, “Describing Uncertainties in Single Sample Experiments,” Mech. Engr., Jan., p. 3.
17.
Ladwig, M. and Fottner, L., 1993, “Experimental Investigations of the Influence of Incoming Wakes on the Losses of a Linear Turbine Cascade,” ASME Paper No. 93-GT-394.
18.
Mayle
R. E.
,
1991
, “
Role of Laminar-Turbulent Transition in Gas Turbine Engines
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
113
, pp.
509
–
537
.
19.
Mee
D. J.
,
Baines
N. C.
,
Oldfield
M. L. G.
, and
Dickens
T. E.
,
1992
, “
An Examination of the Contributions to Loss on a Transonic Turbine Blade in Cascade
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
114
, pp.
155
–
162
.
20.
Moffat, R. J., 1980, “Experimental Methods in the Thermosciences,” Dept. Mech. Engr., Stanford, University.
21.
Moore
J.
,
Shaffer
D. M.
, and
Moore
J. G.
,
1987
, “
Reynolds Stress and Dissipation Downstream of a Turbine Cascade
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
109
, p.
258
258
.
22.
Nakayama
A.
, and
Kreplin
H.-P.
,
1994
, “
Characteristics of Asymmetric Turbulent Near Wakes
,”
Phys. Fluids
, Vol.
6
, No.
7
, p.
2430
2430
.
23.
Nealy
D. A.
,
Mihelc
M. S.
,
Hylton
L. D.
, and
Gladden
H. J.
,
1984
, “
Measurements of Heat Transfer Distribution Over the Surfaces of Highly Loaded Turbine Nozzle Guide Vanes
,”
ASME Journal of Engineering for Gas Turbines and Power
, Vol.
106
, pp.
149
–
158
.
24.
Schlichting, H., 1979, Boundary Layer Theory, 7th ed., McGraw-Hill, New York.
25.
Van Fossen, G. J., and Ching, C. Y., 1994, “Measurements of the Influence of Integral Length Scale on Stagnation Region Heat Transfer,” presented at the Fifth Int. Sym. on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC-5), Kaanapali, Maui, HI, Paper No. TP-16.
26.
Van Fossen, G. J., and Simoneau, R. J., 1994, “Stagnation Region Heat Transfer: The Influence of Turbulence Parameters, Reynolds Number, and Body Shape,” presented at the AIAA/ASME Thermophysics and Heat Transfer Conference, Colorado Springs, Co, June 20–23.
27.
Van Dresar
N. T.
, and
Mayle
R. E.
,
1988
, “
Stagnation Transfer Rates for Incident Flow With High Turbulence Intensities
,”
ASME HTD
-Vol.
101
, p.
165
165
.
28.
Weygandt
J. H.
, and
Mehta
R. D.
,
1995
, “
Three-Dimensional Structure of Straight and Curved Plane Wakes
,”
J. Fluid Mechanics
, Vol.
282
, pp.
279
–
311
.
29.
White, F. M., 1991, Viscous Fluid Flow, 2nd ed., McGraw-Hill, New York.
30.
Wittig, S., Schulz, A., Dullenkopf, K., and Fairbank, J., 1988, “Effects of Free-Stream Turbulence and Wake Characteristics on Heat Transfer Along a Cooled Gas Turbine Blade,” ASME Paper No. 88-GT-179.
31.
Wubben, F. J. W., 1991, “Single and Cross Hot-Wire Anemometry in Incompressible Flow,” Report LR-663, Faculty of Aerospace Engineering, Delft University of Technology, The Netherlands.
32.
Zimmerman, D. R., 1990, “Three-Dimensional Laser Anemometer Measurements in a Linear Turbine Vane Cascade,” Forum on Turbulent Flows—1990, ASME Fed-Vol. 94, p. 143.
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