The present work details the occurrence of the Kelvin–Helmholtz instability in a centrifugal compressor operating near stall. The analysis is based on unsteady three-dimensional simulations performed on a calculation domain covering the full annulus for the impeller and the vaned diffuser. A detailed investigation of the flow structure is presented, together with its evolution consequent to the mass flow reduction. It is demonstrated that this reduction leads to an enlargement of the low-momentum flow region initially induced by the combination of the secondary and leakage flows. When the compressor operates near stall, the shear layer at the interface between the main flow and this low-momentum flow becomes unstable and induces a periodic vortex shedding. The frequency of such an unsteady phenomenon is not correlated with the blade-passing frequency. Its signature is thus easily isolated from the deterministic rotor/stator interaction. Its detection requires full-annulus simulations with an accurate resolution in time and space, which explains why it has never been previously observed in centrifugal compressors.

References

References
1.
Greitzer
,
E. M.
,
1981
, “
The Stability of Pumping Systems—The 1980 Freeman Scholar Lecture
,”
ASME J. Fluids Eng.
,
103
(
2
), pp.
193
242
.
2.
Skoch
,
G. J.
,
2003
, “
Experimental Investigation of Centrifugal Compressor Stabilization Techniques
,”
ASME
Paper No. GT2003-38524.
3.
Camp
,
T. R.
, and
Day
,
I. J.
,
1998
, “
1997 Best Paper Award—Turbomachinery Committee: A Study of Spike and Modal Stall Phenomena in a Low-Speed Axial Compressor
,”
ASME J. Turbomach.
,
120
(
3
), pp.
393
401
.
4.
Mailach
,
R.
,
Lehmann
,
I.
, and
Vogeler
,
K.
,
2001
, “
Rotating Instabilities in an Axial Compressor Originating From the Fluctuating Blade Tip Vortex
,”
ASME J. Turbomach.
,
123
(
3
), pp.
453
460
.
5.
Marz
,
J.
,
Hah
,
C.
, and
Neise
,
W.
,
2002
, “
An Experimental and Numerical Investigation Into the Mechanisms of Rotating Instability
,”
ASME J. Turbomach.
,
124
(
3
), pp.
367
374
.
6.
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
), pp.
24
30
.
7.
Trebinjac
,
I.
,
Bulot
,
N.
,
Ottavy
,
X.
, and
Buffaz
,
N.
,
2011
, “
Surge Inception in a Transonic Centrifugal Compressor Stage
,”
ASME
Paper No. GT2011-45116.
8.
Toyama
,
K.
,
Runstadler
,
P.
, and
Dean
,
R.
,
1977
, “
An Experimental Study of Surge in Centrifugal Compressors
,”
ASME J. Fluids Eng.
,
99
(
1
), pp.
115
124
.
9.
Mizuki
,
S.
, and
Oosawa
,
Y.
,
1991
, “
Unsteady Flow Within Centrifugal Compressor Channels Under Rotating Stall and Surge
,”
ASME
Paper No. 91-GT-085.
10.
Tomita
,
I.
,
Ibaraki
,
S.
,
Furukawa
,
M.
, and
Yamada
,
K.
,
2013
, “
The Effect of Tip Leakage Vortex for Operating Range Enhancement of Centrifugal Compressor
,”
ASME J. Turbomach.
,
135
(
5
), p.
051020
.
11.
Spakovszky
,
Z.
, and
Roduner
,
C.
,
2009
, “
Spike and Modal Stall Inception in an Advanced Turbocharger Centrifugal Compressor
,”
ASME J. Turbomach.
,
131
(
3
), p.
031012
.
12.
Emmons
,
H.
,
Pearson
,
C.
, and
Grant
,
H.
,
1955
, “
Compressor Surge and Stall Propagation
,”
Trans. ASME
,
77
(
4
), pp.
455
469
.
13.
Dufour
,
G.
,
Carbonneau
,
X.
,
Arbez
,
P.
,
Cazalbou
,
J.-B.
, and
Chassaing
,
P.
,
2004
, “
Mesh-Generation Parameters Influence on Centrifugal Compressor Simulation for Design Optimization
,”
ASME
Paper No. HT-FED2004-56314.
14.
Cambier
,
L.
, and
Gazaix
,
M.
,
2002
,
elsA: An Efficient Object-Oriented Solution to CFD Complexity
,
Office National d Etudes et de Recherches Aerospatiales Onera-Publications-Tp(15)
.
15.
Spalart
,
P. R.
, and
Allmaras
,
S. R.
,
1994
, “
A One-Equation Turbulence Model for Aerodynamic Flows
,”
La Rech. Aérospaciale
,
1
, pp.
5
21
.
16.
Jameson
,
A.
,
1991
, “
Time Dependent Calculations Using Multigrid, With Applications to Unsteady Flows Past Airfoils and Wings
,”
AIAA
Paper No. 1596.
17.
Yoon
,
S.
, and
Jameson
,
A.
,
1987
, “
An Lu-SSOR Scheme for the Euler and Navier–Stokes Equations
,”
AIAA
Paper No. 600.
18.
Sicot
,
F.
,
Dufour
,
G.
, and
Gourdain
,
N.
,
2012
, “
A Time-Domain Harmonic Balance Method for Rotor/Stator Interactions
,”
ASME J. Turbomach.
,
134
(
1
), p.
011001
.
19.
Fillola
,
G.
,
Le Pape
,
M.-C.
, and
Montagnac
,
M.
,
2004
,
Numerical Simulations Around Wing Control Surfaces
,
Office National d Etudes et de Recherches Aerospatiales Onera-Publications-Tp(186)
.
20.
Dufour
,
G.
,
Carbonneau
,
X.
,
Cazalbou
,
J.-B.
, and
Chassaing
,
P.
,
2006
, “
Practical Use of Similarity and Scaling Laws for Centrifugal Compressor Design
,”
ASME
Paper No. GT2006-91227.
21.
Cumpsty
,
N. A.
,
1989
,
Compressor Aerodynamics
,
Longman Scientific & Technical
,
Essex, UK
.
22.
Jeong
,
J.
, and
Hussain
,
F.
,
1995
, “
On the Identification of a Vortex
,”
J. Fluid Mech.
,
285
, pp.
69
94
.
23.
Michalke
,
A.
,
1964
, “
On the Inviscid Instability of the Hyperbolictangent Velocity Profile
,”
J. Fluid Mech.
,
19
(
4
), pp.
543
556
.
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