TY - JOUR
T1 - Frequency control of cylindrical bluff body wake by using microactuators
AU - Inoue, Masahiro
AU - Furukawa, Masato
AU - Yamamoto, Yoshihisa
AU - Hirata, Kazuya
AU - Hosaka, Toshihiko
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1997
Y1 - 1997
N2 - The 'lock-in' phenomenon has been investigated experimentally by vibrating cylindrical bluff body surfaces locally using piezoelectric actuators. The maximum amplitude of oscillation is of the order of 20 μm (nearly 1.0 × 10-3 times the body thickness), and the excitation frequency covers below and above a natural vortex shedding frequency from the body. The Reynolds number ranges from 5.25 × 103 to 2.31 × 104. Substantial entrainment of vortex shedding frequency has been observed by exciting the upstream surface of sidewalls, where a short laminar separation bubble exists. Vortex shedding becomes more periodical and the total pressure in the wake becomes high by the local excitation of body surfaces. Possibilities for application to the active control of vibration and noise due to vortex shedding, as well as to drag reduction are discussed.
AB - The 'lock-in' phenomenon has been investigated experimentally by vibrating cylindrical bluff body surfaces locally using piezoelectric actuators. The maximum amplitude of oscillation is of the order of 20 μm (nearly 1.0 × 10-3 times the body thickness), and the excitation frequency covers below and above a natural vortex shedding frequency from the body. The Reynolds number ranges from 5.25 × 103 to 2.31 × 104. Substantial entrainment of vortex shedding frequency has been observed by exciting the upstream surface of sidewalls, where a short laminar separation bubble exists. Vortex shedding becomes more periodical and the total pressure in the wake becomes high by the local excitation of body surfaces. Possibilities for application to the active control of vibration and noise due to vortex shedding, as well as to drag reduction are discussed.
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U2 - 10.1299/kikaib.63.605_69
DO - 10.1299/kikaib.63.605_69
M3 - Article
AN - SCOPUS:0030702316
SN - 0387-5016
VL - 63
SP - 69
EP - 75
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
IS - 605
ER -