Flow instabilities like rotating stall can lead to severe vibrations in turbomachines if the eigenfrequency of the rotor is equal to the stall frequency. The goal of the present work is to shed some light on the origin of the rotating stall phenomenon in a centrifugal pump. The resulting fluctuating loads are quantified using numerical computations. For the chosen configuration transient PIV data are available for validation. In addition to measuring the stall frequency in the stationary frame, the CFD data is analyzed in the rotating frame. A Fourier analysis is done for a large number of sample points. This enables us to determine the local variation of amplitudes for a given frequency. Together with eigenfrequencies and eigenmodes of the rotor determined from modal analysis, it is possible to evaluate the risk of resonance vibration excited from fluctuating fluid forces.

References

References
1.
Pampreen
,
R.
, 1993,
Compressor Surge and Stall
, Norwich, Vermont Concepts ETI.
2.
Krause
,
N.
Zähringer
,
K.
, and
Pap
,
E.
, 2005. “
Time-Resolved Particle Image Velocimetry for the Investigation of Rotating Stall in a Radial Pump
,”
Exp. Fluids
,
39
, pp.
192
201
.
3.
Lohasz
,
M. M.
,
Nagy
,
L.
, and
Wurm
,
H.
, 2009, “
LES of the Transitional Flow in a Miniature Centrifugal Pump
,” in
Proceedings of the 14th Conference on Modelling Fluid Flow
.
4.
Byskov
,
R.
,
Jacobsen
,
C.
, and
Pedersen
,
N.
, 2003, “
Flow in a Centrifugal Pump Impeller at Design and Off-Design Conditions - Part II: Large Eddy Simulations
,”
J. Fluids Eng.
,
125
, pp.
73
83
.
5.
Feng
,
J.
,
Benra
,
F.-K.
, and
Dohmen
,
H.
, 2009, “
Unsteady Flow Visualization at Part-Load Conditions of a Radial Diffuser Pump: By PIV and CFD
,”
J. Visualization
,
12
(
1
), pp.
65
72
.
6.
Martini
,
P.
,
Schulz
,
A.
,
Bauer
,
H.-J.
, and
Whitney
,
C.
, 2006, “
Detached Eddy Simulation of Film Cooling Performance on the Trailing Edge Cutback of Gas Turbine Airfoils
,”
ASME J. Turbomach.
,
128
(
2
), pp.
292
299
7.
Iwakiri
,
K.
,
Furukawa
,
M.
,
Ibaraki
,
S.
, and
Tomita
,
I.
, 2009, “
Unsteady and Three-Dimensional Flow Phenomena in a Transonic Centrifugal Compressor Impeller at Rotating Stall
,”
Proceedings of the ASME Turbo Expo
,
7
(
B
), pp.
1611
1622
.
8.
Lucius
,
A.
, and
Brenner
,
G.
, 2010, “
Unsteady CFD Simulations of a Pump in Part Load Conditions Using Scale-Adaptive Simulation
,”
Int. J. Heat Fluid Flow
,
31
, pp.
1113
1118
.
9.
Pfleiderer
,
C.
, and
Petermann
,
H.
, 1991,
Strömungsmaschinen
,
6th ed.
,
Springer
,
Berlin
.
10.
Spallart
,
P.
, 2000, “
Strategies for Turbulence Modelling and Simulations
,”
Int. J. Heat Fluid Flow
,
21
, pp.
252
263
.
11.
Barth
,
T.
, and
Jesperson
,
D.
, 1989, “
The Design and Application of Upwind Schemes on Unstructured Meshes
,” AIAA Paper 89-0366.
12.
Wilcox
,
D. C.
, 2006,
Turbulence Modeling for CFD
,
3rd ed.
,
DWC Industries, Inc.
,
La Canada, California
.
13.
Esch
,
T.
, and
Menter
,
F.
, 2003, “
Heat Transfer Prediction Based on Two-Equation Turbulence Models
,” in
Proceedings of the 4th International Symposium on Turbulence, Heat and Mass Transfer
.
14.
Dean
,
R.
, 1978, “
Reynolds Number Dependence of Skin Friction and Other Bulk Flow Variables in Two-Dimensional Rectangular Duct Flow
,”
ASME J. Fluids Eng.
,
100
, pp.
215
223
.
15.
Krause
,
N.
, 2008, “
Untersuchungen der Laufradströmungen einer Kreiselpumpe unter Teillastbedingungen mit Hilfe der zeitaufgel¨osten Particle Image Velocimetry
,” PhD thesis, Otto-von-Guericke Universität Magdeburg.
16.
Kammeyer
,
K.-D.
, and
Kroschel
,
K.
, 2002,
Digitale Signalverarbeitung
,
Teubner
,
Stuttgart
.
17.
Gant
,
S. E.
, 2010, “
Reliability Issues of LES-Related Approaches in an Industrial Context
,”
Flow, Turbul. Combust.
,
84
, pp.
325
335
.
18.
Baggett
,
J.
,
Jimenez
,
J.
, and
Kravchenko
,
A.
, 1997, “
Resolution Requirements of Large-Eddy Simulations of Shear Flows
,” Center for Turbulence Research Annual Research Briefs, pp.
51
66
.
19.
Celik
,
I.
,
Cehreli
,
N.
, and
Yavuz
,
I.
, 2005, “
Index of Resolution Quality for Large Eddy Simulations
,”
ASME J. Fluids Eng.
,
127
, pp.
949
958
.
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