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Aerodynamically Excited Vibration And Flutter Of A Thin Disk Rotating At Supercritical Speed

✍ Scribed by C.D'Angelo III; C.D. Mote Jr.

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 664 KB
Volume: 168
Category: Article
ISSN: 0022-460X
DOI: 10.1006/jsvi.1993.1359

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✦ Synopsis

This research describes aerodynamically excited supercritical disk vibration observed in experiments. Spectral analysis and moiré photography show that for most fluid densities, a single supercritical backward traveling wave becomes unstable. At pre-flutter speeds, the fluid acts as a random excitation source, but at the flutter speed and at higher speeds the fluid and the disk are strongly coupled. Coupling becomes sufficiently strong that the post-flutter frequency becomes nearly independent of rotation speed, even though the disk stiffens centrifugally as speed increases. Disk flutter is subsonic and often occurs in incompressible flow. Reducing the fluid density decreases the vibration amplitude at all speeds and increases the flutter speed.

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