In this paper, the effect of aerodynamic mistuning on stability of a compressor cascade is studied. The experiments have been carried out at a low-speed test facility of the Technische Universität Berlin. The test section contains a linear cascade with compressor blades that are forced to oscillate in sinusoidal pitching motion. The aerodynamic mistuning is realized by a blade-to-blade stagger angle variation, and three mistuning patterns have been investigated: one-blade mis-staggering, alternating mis-staggering, and random mis-staggering. Mis-staggering can have a stabilizing or destsabilizing effect, but depends strongly on the amount of detuning that alters the flow passage. For positive stagger angle variation for the one-blade and alternating mis-staggering, the trend of the damping curve was maintained, in the sense that the unstable interblade phase angles (IBPAs) remained unstable. For negative stagger angle variation, one IBPA shifted from stable to unstable. For the random pattern, only very moderate changes are observed. The cascade stability was not noticeably affected by the aerodynamic mistuning.

References

References
1.
Bendiksen
,
O.
,
1984
, “
Flutter of Mistuned Turbomachinery Rotors
,”
ASME J. Eng. Gas Turbines Power
,
106
(
1
), pp.
25
33
.
2.
Crawley
,
E. F.
, and
Hall
,
K. C.
,
1985
, “
Optimization and Mechanisms of Mistuning in Cascades
,”
ASME J. Eng. Gas Turbines Power
,
107
(
2
), pp.
418
426
.
3.
Dugundji
,
J.
, and
Hall
,
K.
,
1984
, “
Flutter and Forced Response of Mistuned Rotors Using Standing Wave Analysis
,”
AIAA J.
,
22
(
11
), pp.
1652
1661
.
4.
Erwins
,
D.
,
1969
, “
The Effects of Detuning Upon the Forced Vibrations of Bladed Disks
,”
J. Sound Vib.
,
9
(
1
), pp.
65
79
.
5.
Kaza
,
K.
, and
Kielb
,
R.
,
1982
, “
Flutter and Response of a Mistuned Cascade in Incompressible Flow
,”
AIAA J.
,
20
(
8
), pp.
1120
1127
.
6.
Li
,
J.
,
Aye-Addo
,
N.
,
Kormanik
,
I. I. I.
,
Key
,
N.
, and
Kielb
,
R.
,
2017
, “
Mistuned Higher-Order Mode Forced Response of an Embedded Compressor Rotor: Part I—Steady and Unsteady Aerodynamics
,”
Proceedings of ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, Charlotte
,
NC
,
June 26–30
, pp.
1
13
.
7.
Li
,
J.
,
Aye-Addo
,
N.
,
Kielb
,
R.
, and
Key
,
N.
,
2017
, “
Mistuned Higher-Order Mode Forced Response of an Embedded Compressor Rotor—Part II: Mistuned Forced Response Prediction
,”
ASME J. Turbomach.
,
140
(
3
), p.
031006
.
8.
Hoyniak
,
D.
, and
Fleeter
,
S.
,
1986
, “
Aerodynamic Detuning Analysis of an Unstalled Supersonic Turbofan Cascade
,”
ASME J. Eng. Gas Turbines Power
,
108
(
1
), pp.
60
67
.
9.
Sladojevic
,
I.
,
Sayma
,
A. I.
, and
Imregun
,
M.
,
2007
, “
Influence of Stagger Angle Variation on Aerodynamic Damping and Frequency Shifts
,”
Proceedings of ASME Turbo Expo 2007: Power for Land, Sea and Air
,
Montreal, Canada
,
May 14–17
, pp.
1
18
.
10.
Stur
,
H.
,
Schmitt
,
S.
, and
Ashcroft
,
G.
,
2008
, “
Aerodynamic Mistuning of Structurally Coupled Blades
,”
Proceedings of ASME Turbo Expo 2008: Power for Land, Sea and Air
,
Berlin, Germany
,
June 9–13
.
11.
Ekici
,
K.
,
Kielb
,
R. E.
, and
Hall
,
K. C.
,
2010
, “
Aerodynamic Asymmetry Analysis of Unsteady Flows in Turbomachinery
,”
ASME J. Turbomach.
,
132
(
1
), p.
011006
.
12.
Ekici
,
K.
,
Kielb
,
R. E.
, and
Hall
,
K. C.
,
Jan. 2013
, “
The Effect of Aerodynamic Asymmetries on Turbomachinery Flutter
,”
J. Fluids Struct.
,
36
(
2009
), pp.
1
17
.
13.
Vogt
,
D.
,
Glodic
,
N.
, and
Fransson
,
T.
,
2009
, “
The Effect of Unsteady Aerodynamic Asymmetric Perturbations on the Mode Shape Sensitivity of an Oscillating LPT Cascade
,”
Proceedings of ISUAAAT 12
,
London, UK
,
Sept. 1–4
.
14.
Glodic
,
N.
,
Fransson
,
T.
, and
Vogt
,
D.
,
2011
, “
Numerical Investigation of Mistuned Aerodynamic Influence Coefficients in an Oscillating LPT Cascade
,”
Proceedings of ASME Turbo Expo 2011: Power for Land, Sea, and Air
,
Vancouver, British Columbia, Canada
,
June 6–10
.
15.
Malzacher
,
L.
,
Geist
,
S.
,
Peitsch
,
D.
, and
Hennings
,
H.
,
2016
, “
A Low Speed Compressor Test Rig for Flutter Investigation
,”
Proceedings of ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
,
Seoul, South Korea
,
June 13–17
.
16.
Carta
,
F.
,
1978
, “
Experimentally Determined Stability Parameters of a Subsonic Cascade Oscillating Near Stall
,”
J. Eng. Power
,
100
(
1
), pp.
111
120
.
17.
Carta
,
F.
,
1982
, “
An Experimental Investigation of Gapwise Periodicity and Unsteady Aerodynamic Response in an Oscillating Cascade
,” NASA, Technical Report, NASA Contractor Report 3513.
18.
Carta
,
F.
, and
Niebanck
,
C.
,
1969
, “
Prediction of Rotor Instability at High Forward Speeds
,” USAAVLABS, Technical Report 68-180.
19.
Sachs
,
W.
,
1991
, “
On Flutter Behaviour of a 2-D Compressor Cascade in Incompressible Flow
,” Ph.d. thesis,
RWTH Aachen
,
Germany
.
20.
Lee
,
T.
, and
Su
,
Y. Y.
,
2015
, “
Surface Pressures Developed on an Airfoil Undergoing Heaving and Pitching Motion
,”
J. Fluids Eng.
,
137
(
5
), p.
051105
.
21.
Keerthi
,
M. C.
,
Shubham
,
S.
, and
Kushari
,
A.
,
2017
, “
Aerodynamic Influence of Oscillating Adjacent Airfoils in a Linear Compressor Cascade
,”
AIAA J.
,
55
(
12
), pp.
4113
4126
.
22.
Huang
,
R. F.
, and
Lin
,
C. L.
,
1995
, “
Vortex Shedding and Shear-Layer Instability of Wing at Low-Reynolds Numbers
,”
AIAA J.
,
33
(
8
), pp.
1398
1403
.
You do not currently have access to this content.