The Institute of Aeroelasticity operates a test facility which enables aeroelastic investigations of plane cascades in low-speed flow. The test stand serves as a pilot facility to develop tools for analogous investigations in transonic flow. Eleven blades are elastically suspended in a windtunnel with a 1 × 0.2 m2 cross section. This paper describes the experimental method of determining the flutter boundary by extrapolation of the results measured in subcritical flow. A two-dimensional theoretical model of the 11 blades, including the windtunnel walls, permits the computation of unsteady pressures, forces, and moments in close relation to the experiment. The prediction of flutter is compared with experimental results. In the present investigation, the motion of the blades is constrained to pitch around mid-chord. The vibrating blades are mechanically uncoupled. Any interaction between the blades is effected by the air stream, leading to a sensitive dependence on the aerodynamic forces.

1.
AGARD, 1987, Aeroelasticity in Axial-Flow Turbomachines: Vol. 1—Unsteady Turbomachinery Aerodynamics, M. F. Platzer, and F. O. Carta, eds., AGARDograph 298.
2.
AGARD, 1988, Aeroelasticity in Axial-Flow Turbomachines: Vol. 2—Structural Dynamics and Aeroelasticity, M. F. Platzer, and F. O. Carta, eds., AGARDograph 298.
3.
Bendiksen
O. O.
,
1984
, “
Flutter of Mistuned Turbomachinery Rotors
,”
ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER
, Vol.
106
, pp.
25
33
.
4.
Bendiksen
O. O.
,
1993
, “
Aeroelastic Problems in Turbomachines
,”
ASME Flight-Vehicle Materials
, Structures and Dynamics: Vol.
5
—Structural Dynamics and Aeroelasticity, T. Weisshar, ed., ASME, New York, N.Y., pp.
241
297
.
5.
Bloemhof, H., 1988, “Flutter of Blade Rows With Mistuning and Structural Coupling,” report, Communication du Laboratoire de Thermique Applique´e et de Turbomachines, EPF Lausanne.
6.
Buffum
D. H.
, and
Fleeter
S.
,
1990
, “
Oscillating Cascade:Aerodynamics by an Experimental Influence Cofficient Technique
,”
Journal of Propulsion
, Vol.
6
(
5
), pp.
612
620
.
7.
Carta, F. O., 1982, “An Experimental Investigation of Gapwise Periodicity and Unsteady Aerodynamic Response in an Oscillating Cascade: I—Experimental and Theoretical Results,” NASA CR-3513, UTRC, East Hartford, CN.
8.
Crawley
E. F.
, and
Hall
K. C.
,
1985
, “
Optimization and Mechanisms of Mistuning in Cascades
,”
ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER
, Vol.
107
, pp.
418
426
.
9.
Crawley, E. F., 1988, “Aeroelastic Formulation for Tuned and Mistuned Rotors,” AGARD—Aeroelasticity in Axial-Flow Turbomachines: Vol. 2—Structural Dynamics and Aeroelasticity, M. F. Platzer, and F. O. Carta, eds., AGARDograph 298.
10.
Dugundji
J.
, and
Bundas
D. J.
,
1984
, “
Flutter and Forced Response of Mistuned Rotors Using Standing Wave Analysis
,”
AIAA Journal
, Vol.
22
(
11
), pp.
1652
1661
.
11.
Fo¨rsching
H. W.
,
1994
, “
Aeroelastic Stability of Cascades in Turbomachinery
,”
Prog. Aerospace Sci.
, Vol.
30
, pp.
213
266
.
12.
Hennings, H., 1994, “Experimentelle Untersuchung des Flatterverhaltens eines ebenen Gitters unter Beru¨cksichtigung gezielter Verstimmung: Messung und Analyse (Experimental Investigation of Flutter Behavior of a Plane Cascade Including Mistuning: Measurement and Analysis),” German Aerospace Research Establishment (DLR), Tech. Report IB 232–94J07.
13.
Hennings, H., and Send, W., “Experimental Investigation and Theoretical Prediction of Flutter Behaviour of a Plane Cascade in Low-Speed Flow, ASME Paper 96-GT-417.
14.
Kaza
K. R, V.
, and
Kielb
R. E.
,
1982
, “
Flutter and Response of a Mistuned Cascade in Incompressible Flow
,”
AIAA Journal
, Vol.
20
(
8
), pp.
1120
1127
.
15.
Kaza
K. R. V.
, and
Kielb
R. E.
,
1984
, “
Flutter of Turbofan Rotors with Mistuned Blades
,”
AIAA Journal
, Vol.
22
(
11
), pp.
1618
1625
.
16.
Kaza, K. R. V., Mehmed, O., Williams, M., and Moss, L. A., 1987, “Analytical and Experimental Investigation of Mistuning in Propfan Flutter,” ASME Paper 87–0739.
17.
Knauf, W. B., 1985, Experimentelle Untersuchungen zur Ermittlung der aerodynamischen Schaufelda¨mpfung an einem schwingenden Axialverdichtergitter (Experimental Investigation of the Aerodynamic Blade Damping of an Oscillating Axial Compressor Cascade), Ph.D. thesis, Rhein.-Westf. Techn. Hochschule, Aachen, Germany.
18.
Ko¨rba¨cher, H., and Bo¨lcs, A., 1994, “Experimental Investigation of the Unsteady Behavior of the Compressor Cascade in an Annular Ring Channel,” Proceedings, Symposium on Unsteady Aerodynamics and Aerolasticity of Turbomachines, Fukuoka, Japan, pp. 383–400.
19.
Kurkov, A. P., 1982, “Measurements of Self-Excited Rotorblade Vibrations Using Optical Displacements,” NASA TM-82953, NASA Lewis Research Center, Cleveland, Ohio.
20.
Lane
F.
,
1956
, “
System Mode Shapes in the Flutter of Compressor Blade Rows
,”
Journal of Aeronautical Sciences
, Vol.
23
(
1
), pp.
54
66
.
21.
Lembregts, F., 1988, Frequency Domain Identification Techniques for Experimental Multiple Input Modal Analysis, Ph.D. thesis, Katholieke Universiteit Leuven, Belgium.
22.
Sachs, W., 1991, Zum Flatterverhalten eines 2-D Verdichtergitters in inkompressibler Stro¨mung (On the Flutter Behavior of a 2D Compressor Cascade in Incompressible Flow), Ph.D. thesis, Rhein.-Westf. Techn. Hochschule, Aachen, Germany.
23.
Send
W.
,
1984
, “
Der instationa¨re Nachlauf hinter schlanken Auftriebso¨rpern in inkompressibler Stro¨mung (The Unsteady Wake Function of Slender Aerodynamic Bodies in Incompressible Flow
,”
Zeitschrift fu¨r Angewandte Math. und Mech
, Vol.
64
, pp.
7
15
.
24.
Send, W., 1995,“Zur Lo¨sung des ra¨umlichen Interferenzproblems in der Instationa¨ren Aerodynamik (On the Solution of the Spatial Interference Problem in Unsteady Aerodynamics),” Research Note DLR-FB 95–42. German Aerospace Research Establishment (DLR), Germany.
25.
Stargardter, H., 1988, “Fan Flutter Test,” AGARD—Aeroelasticity in AxialFlow Turbomachines: Vol. 2—Structural Dynamics and Aeroelasticity, M. F. Platzer, and F. O. Carta, eds., AGARDograph 298.
26.
Storey
P. A.
,
1984
, “
Holographic Vibration Measurement of a Rotating Fluttering Fan
,”
AIAA Journal
, Vol.
22
(
2
), pp.
234
241
.
27.
Sze´che´nyi, E., Cararelli, I., Notin, C, and Girault, J. P., 1984, “A Straight Cascade Wind-tunnel Study of Fan Blade Flutter in Started Supersonic Flow,” Proceedings, Symposium on Unsteady Aerodynamics of Turbomachines and Propellers, Cambridge, England, pp. 447–458.
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