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Phase Averaging by Wavelet Transformation and the Application to Periodically Fluctuated Separation Flow

[+] Author Affiliations
Masaki Yamagishi

Nagaoka National College of Technology, Nagaoka, Niigata, Japan

Tomoko Togano

Otsuma Women’s University, Tama, Tokyo, Japan

Shinichi Tashiro

Tokyo Metropolitan Institute of Technology, Hino, Tokyo, Japan

Paper No. FEDSM2002-31121, pp. 1601-1606; 6 pages
doi:10.1115/FEDSM2002-31121
From:
  • ASME 2002 Joint U.S.-European Fluids Engineering Division Conference
  • Volume 1: Fora, Parts A and B
  • Montreal, Quebec, Canada, July 14–18, 2002
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3615-0 | eISBN: 0-7918-3600-2
  • Copyright © 2002 by ASME

abstract

The vortex structures in a separated region are generated by the motion of the separated shear layer caused by the introduction of periodic fluctuation. The main cause of the motion of the separated shear layer is the external fluctuation with the characteristic frequency. In order to investigate the principal motion of the velocity field, phase averaging was conducted to the velocity signals obtained by single hot-wire measurement. In phase averaging, wavelet analysis was applied to obtain the dominant frequency and the characteristic phase in the fluctuation. The profiles and the contours of the phase-averaged velocity could be found and discussed. The profiles vary dynamically at each phase and show the periodic motion of the shear layer. The separated shear layer flutters with the external fluctuation in the mean flow. If the suitable frequency is selected in the external fluctuation, the separated region disappears in almost all each phases owing to the depression of the shear layer near the wall.

Copyright © 2002 by ASME

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