Æolian tones and stall flutter of lengthy objects in fluid flows.

Landa, P. S. and McClintock, P. V. E. (2010) Æolian tones and stall flutter of lengthy objects in fluid flows. Journal of Physics A: Mathematical and Theoretical, 43 (37). ISSN 1751-8113

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Abstract

We theoretically consider the spontaneous oscillations of an elastic cylinder in a streaming fluid flow. Such oscillations are responsible for stall flutter in e.g. turbine blades and bridges, or Æolian tones when in the acoustic range. The process of vortex separation from the oscillating surface is modelled as a selfexcited oscillator. The vortex separation frequency remains synchronized with the oscillations of the cylinder over a great range of frequency mismatches, enabling the amplitudes and frequencies to be calculated. Only when the vortex separation frequency is much less than the cylinder’s natural oscillation frequency the synchronization breaks down, and then two-frequency oscillations (beats) occur.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Physics A: Mathematical and Theoretical
Uncontrolled Keywords:
/dk/atira/pure/researchoutput/libraryofcongress/qc
Subjects:
ID Code:
35025
Deposited On:
05 Jan 2011 10:54
Refereed?:
Yes
Published?:
Published
Last Modified:
15 Aug 2020 01:33