Influence of unsteady wake on a turbulent separation bubble |
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| Authors: | S Chun H J Sung |
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| Institution: | (1) Department of Mechanical Engineering Korea Advanced Institute of Science and Technology 373-1, Kusong-dong, Yusong-ku Taejon, 305-701, Korea e-mail: hjsung@kaist.ac.kr Tel.: +82-42-8693027 Fax: +82-42-8695027, KR |
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| Abstract: | An experimental study was made of turbulent separated and reattaching flow over a blunt body, where unsteady wake was generated
by a spoked-wheel type of wake generator with cylindrical rods. The influence of unsteady wake was scrutinized by altering
the rotation direction (clockwise and counter-clockwise) and the normalized passing frequency (0 ≤ St
H
≤ 0.20). The Reynolds number based on the cylindrical rod was Re
d
=375. A phase-averaging technique was employed to characterize the unsteady wake. The effect of different rotation directions,
which gave a significant reduction of x
R
, was examined in detail. The wall pressure fluctuations on the blunt body were analyzed in terms of the spectrum and the
coherence.
Received: 15 January 2001 / Accepted: 17 July 2001 |
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| Keywords: | Wake generator Unsteady wake Separation bubble |
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