The flow in a fan test-rig is studied with combined experimental and numerical methods, with a focus on the tip-leakage flow. A zonal RANS/LES approach is introduced for the simulation: the region of interest at tip is computed with full large-eddy simulation (LES), while Reynolds-averaged Navier–Stokes (RANS) is used at inner radii. Detailed comparisons with the experiment show that the simulation gives a good description of the flow. In the region of interest at tip, a remarkable prediction of the velocity spectrum is achieved, over about six decades of energy. The simulation precisely captures both the tonal and broadband contents. Furthermore, a detailed analysis of the simulation allows identifying a tip-leakage vortex (TLV) wandering, whose influence onto the spectrum is also observed in the experiment. This phenomenon might be due to excitation by upstream turbulence from the casing boundary layer and/or the adjacent TLV. It may be a precursor of rotating instability. Finally, considering the outlet duct acoustic spectrum, the vortex wandering appears to be a major contribution to noise radiation.

References

References
1.
Lakshminarayana
,
B.
,
1996
,
Fluid Dynamics and Heat Transfer of Turbomachinery
,
John Wiley & Sons Inc.
,
Hoboken, NJ
.
2.
Vo
,
H. D.
,
Tan
,
C. S.
, and
Greitzer
,
E. M.
,
2008
, “
Criteria for Spike Initiated Rotating Stall
,”
ASME J. Turbomach.
,
130
(
1
), p.
011023
.10.1115/1.2750674
3.
Camussi
,
R.
,
Grilliat
,
J.
,
Caputi-Gennaro
,
G.
, and
Jacob
,
M. C.
,
2010
, “
Experimental Study of a Tip Leakage Flow: Wavelet Analysis of Pressure Fluctuations
,”
J. Fluid Mech.
,
660
, pp.
87
113
.10.1017/S0022112010002570
4.
Jacob
,
M. C.
,
Grilliat
,
J.
,
Camussi
,
R.
, and
Caputi Gennaro
,
G.
,
2010
, “
Aeroacoustic Investigation of a Single Airfoil Tip Leakage Flow
,”
Int. J. Aeroacoustics
,
9
(
3
), pp.
253
272
.10.1260/1475-472X.9.3.253
5.
Muthanna
,
C.
, and
Devenport
,
W. J.
,
2004
, “
Wake of a Compressor Cascade With Tip Gap, Part 1: Mean Flow and Turbulence Structure
,”
AIAA J.
,
42
(
11
), pp.
2320
2331
.10.2514/1.5270
6.
Gourdain
,
N.
,
Wlassow
,
F.
, and
Ottavy
,
X.
,
2012
, “
Effect of Tip Clearance Dimensions and Control of Unsteady Flows in a Multi-Stage High-Pressure Compressor
,”
ASME J. Turbomach.
,
134
(
5
), p.
051005
.10.1115/1.4003815
7.
Storer
,
J. A.
, and
Cumpsty
,
N. A.
,
1991
, “
Tip Leakage Flow in Axial Compressors
,”
ASME J. Turbomach.
,
113
(
2
), pp.
252
259
.10.1115/1.2929095
8.
You
,
D.
,
Wang
,
M.
,
Moin
,
P.
, and
Mittal
,
R.
,
2007
, “
Large-Eddy Simulation Analysis of Mechanisms for Viscous Losses in a Turbomachinery Tip-Clearance Flow
,”
J. Fluid Mech.
,
586
, pp.
177
204
.10.1017/S0022112007006842
9.
Hah
,
C
.,
2009
, “
Large Eddy Simulation of Transonic Flow Field in NASA Rotor 37
,” NASA Glenn Research Center, Cleveland, OH, Technical Report No. TM-2009-215627.
10.
Spalart
,
P. R.
,
2009
, “
Detached-Eddy Simulation
,”
Annu. Rev. Fluid Mech.
,
41
(
1
), pp.
181
202
.10.1146/annurev.fluid.010908.165130
11.
Tucker
,
P.
,
Eastwood
,
S.
,
Klostermeier
,
C.
,
Jefferson-Loveday
,
R.
,
Tyacke
,
J.
, and
Liu
,
Y.
,
2012
, “
Hybrid LES Approach for Practical Turbomachinery Flows—Part I: Hierarchy and Example Simulations
,”
ASME J. Turbomach.
,
134
(
2
), p.
021023
.10.1115/1.4003061
12.
Tucker
,
P.
,
Eastwood
,
S.
,
Klostermeier
,
C.
,
Xia
,
H.
,
Ray
,
P.
,
Tyacke
,
J.
, and
Dawes
,
W.
,
2012
, “
Hybrid LES Approach for Practical Turbomachinery Flows—Part II: Further Applications
,”
ASME J. Turbomach.
,
134
(
2
), p.
021024
.10.1115/1.4003062
13.
Wilcox
,
D. C.
,
1993
,
Turbulence Modeling for CFD
,
DCW Industries, Inc
., La Canada, CA.
14.
Lévêque
,
E.
,
Toschi
,
F.
,
Shao
,
L.
, and
Bertoglio
,
J. P.
,
2007
, “
Shear-Improved Smagorinsky Model for Large-Eddy Simulation of Wall-Bounded Turbulent Flows
,”
J. Fluid Mech.
,
570
, pp.
491
502
.10.1017/S0022112006003429
15.
Cahuzac
,
A.
,
Boudet
,
J.
,
Borgnat
,
P.
, and
Lévêque
,
E.
,
2010
, “
Smoothing Algorithms for Mean-Flow Extraction in Large-Eddy Simulation of Complex Turbulent Flows
,”
Phys. Fluids
,
22
(
12
), p.
125104
.10.1063/1.3490063
16.
Cahuzac
,
A
.,
2012
, “
Aspects Cinétiques et Acoustiques en Simulation Numérique des Grandes Échelles, et Application à L’étude du Controle de l’écoulement de jeu en Turbomachines
,” PhD thesis,
Ecole Centrale de Lyon
,
Lyon, France
.
17.
Boudet
,
J.
,
Caro
,
J.
,
Shao
,
L.
, and
Lévêque
,
E.
,
2007
, “
Numerical Studies Towards Practical Large-Eddy Simulation
,”
J. Therm. Sci.
,
16
(
4
), pp.
328
336
.10.1007/s11630-007-0328-3
18.
Jameson
,
A.
,
1982
, “
Transonic Airfoil Calculations Using the Euler Equations
,”
Numerical Methods in Aeronautical Fluid Dynamics
, Vol.
1
,
Academic Press
,
New York
, pp.
289
308
.
19.
Sagaut
,
P.
,
2002
,
Large Eddy Simulation for Incompressible Flows
,
Springer
,
Berlin, Germany.
20.
Cahuzac
,
A.
,
Boudet
,
J.
,
Jacob
,
M. C.
, and
Kausche
,
P.
,
2011
, “
Large-Eddy Simulation of a Rotor Tip-Clearance Flow
,”
AIAA
Paper No. 2011–2947.10.2514/6.2011-2947
21.
Menter
,
F. R.
,
Kuntz
,
M.
, and
Langtry
,
R.
,
2003
, “
Ten Years of Industrial Experience With the SST Turbulence Model
,”
Turbulence, Heat and Mass Transfer 4
, Begell House Inc.,
New York
.
22.
Day
,
I. J.
,
2006
, “
The Fundamentals of Stall and Surge
,”
Advances in Axial Compressor Aerodynamics
(Lecture Series Monographs),
von Karman Institute
,
Brussels, Belgium
.
23.
Inoue
,
M.
,
Kuroumaru
,
M.
,
Tanino
,
T.
,
Yoshida
,
S.
, and
Furukawa
,
M.
,
2001
, “
Comparative Studies on Short and Long Length-Scale Stall Cell Propagating in an Axial Compressor Rotor
,”
ASME J. Turbomach.
,
123
(
1
), p.
24
.10.1115/1.1326085
24.
März
,
J.
,
Hah
,
C.
, and
Neise
,
W.
,
2002
, “
An Experimental and Numerical Investigation Into the Mechanisms of Rotating Instability
,”
ASME J. Turbomach.
,
124
(
3
), p.
367
.10.1115/1.1460915
25.
Zierke
,
W. C.
,
Farrell
,
K. J.
, and
Straka
,
W. A.
,
1995
, “
Measurements of the Tip Clearance Flow for a High-Reynolds-Number Axial-Flow Rotor
,”
ASME J. Turbomach.
,
117
(
4
), pp.
522
532
.10.1115/1.2836564
26.
Kameier
,
F.
, and
Neise
,
W.
,
1997
, “
Experimental Study of Tip Clearance Losses and Noise in Axial Turbomachines and Their Reduction
,”
ASME J. Turbomach.
,
119
(
3
), pp.
460
471
.10.1115/1.2841145
27.
You
,
D.
,
Wang
,
M.
,
Moin
,
P.
, and
Mittal
,
R.
,
2007
, “
Vortex Dynamics and Low-Pressure Fluctuations in the Tip-Clearance Flow
,”
ASME J. Fluids Eng.
,
129
(
8
), p.
1002
.10.1115/1.2746911
28.
Bailey
,
S. C. C.
, and
Tavoularis
,
S.
,
2008
, “
Measurements of the Velocity Field of a Wing-Tip Vortex, Wandering in Grid Turbulence
,”
J. Fluid Mech.
,
601
, pp.
281
315
.10.1017/S0022112008000694
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