Vibration induced excitation on instability waves in a Blasius flow

Gowree, Erwin R. and Atkin, Christopher J. ORCID: https://orcid.org/0000-0003-2529-1978 (2021) Vibration induced excitation on instability waves in a Blasius flow. In: 32nd Congress of the International Council of the Aeronautical Sciences, ICAS 2021. 32nd Congress of the International Council of the Aeronautical Sciences, ICAS 2021 . International Council of the Aeronautical Sciences, CHN. ISBN 9783932182914

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Abstract

Here we have demonstrated that small amplitude localised vibration can artificially excite both 2D and 3D instability modes. The 2D modes was typical of Tollmien-Schlichting (TS) waves provided that the frequency of excitation lies within the unstable region of the neutral stability region obtained from linear stability theory. Further analysis of the streamwise and spanwise evolution of the instability modes identified from the temporal Fourier transform confirmed the presence of 3D oblique modes excited due to the nature of the mode shape deflection of the vibrating panel which was not uniform in the transverse direction. The effect of spanwise non-uniformity could be increased by activating the motors along the transverse direction. However, despite the higher initial forcing of the 2D TS mode from a combination of both streamwise and spanwise aligned motors, strong interaction with the 3D oblique mode led to a reduction in the growth rate of the TS wave in the farfield region.

Item Type: Book Section
Additional Information: Funding Information: The authors would like to thank Prof Michael Gaster for his recommendations during the experimental campaign and Innovate UK for their financial support to the SANTANA project under grant No. 113001
Uncontrolled Keywords: oblique waves,tollmien-schlichting,vibration,aerospace engineering,control and systems engineering,materials science(all),electrical and electronic engineering ,/dk/atira/pure/subjectarea/asjc/2200/2202
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Depositing User: LivePure Connector
Date Deposited: 20 Jul 2022 11:30
Last Modified: 24 Jul 2022 05:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/86720
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