By using phase averaging technique, turbulent structure in a flow was studied. For the phase angle of the time dependent signal modulated in frequency, data acquisition is difficult. This study proposed a new method of phase averaging by wavelet transformation. The purpose of the present study is to compare the results of the phase averaging by wavelet transformation with those by the traditional phase averaging technique. These two phase averaging techniques were applied to the experimental data of the velocities in a separated flow with periodical fluctuation. Between the results by these techniques, noticeable differences were shown. If the velocity signals include the frequency modulation, the profiles of phase-averaged velocity by the traditional technique will have nearly the same shapes and be similar to those of time-averaged velocity. On the other hand, the profiles by wavelet transformation showed the clear differences at each phase angle even for the velocity signals with modulated frequencies.
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ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference
July 6–10, 2003
Honolulu, Hawaii, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-3697-5
PROCEEDINGS PAPER
Phase Averaging Analysis of the Unsteady Velocity Profiles in a Separated Flow Available to Purchase
Masaki Yamagishi,
Masaki Yamagishi
Nagaoka National College of Technology, Nagaoka, Niigata, Japan
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Tomoko Togano,
Tomoko Togano
Otsuma Women’s University, Tokyo, Japan
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Shinichi Tashiro
Shinichi Tashiro
Tokyo Metropolitan Institute of Technology, Tokyo, Japan
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Masaki Yamagishi
Nagaoka National College of Technology, Nagaoka, Niigata, Japan
Tomoko Togano
Otsuma Women’s University, Tokyo, Japan
Shinichi Tashiro
Tokyo Metropolitan Institute of Technology, Tokyo, Japan
Paper No:
FEDSM2003-45032, pp. 261-266; 6 pages
Published Online:
February 4, 2009
Citation
Yamagishi, M, Togano, T, & Tashiro, S. "Phase Averaging Analysis of the Unsteady Velocity Profiles in a Separated Flow." Proceedings of the ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. Volume 2: Symposia, Parts A, B, and C. Honolulu, Hawaii, USA. July 6–10, 2003. pp. 261-266. ASME. https://doi.org/10.1115/FEDSM2003-45032
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