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RESEARCH PAPERS: Gas Turbines: Structures and Dynamics

Experimental Investigation and Theoretical Predication of Flutter Behavior of a Plane Cascade in Low Speed Flow

[+] Author and Article Information
H. Hennings, W. Send

Bunsenstrase 10, Goettingen, D-37073, Germany

J. Eng. Gas Turbines Power 120(4), 766-774 (Oct 01, 1998) (9 pages) doi:10.1115/1.2818465 History: Received March 03, 1997; Online November 19, 2007

Abstract

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.

Copyright © 1998 by The American Society of Mechanical Engineers
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