TY - JOUR
T1 - Design and control of crossflow instability field
AU - Egami, Yasuhiro
AU - Kohama, Yasuaki
AU - Onodera, Tatsuya
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1997
Y1 - 1997
N2 - Full turbulent transition is induced on a yawed flat plate with a displacement body system in a wind tunnel. First, the transition process is measured in detail using hot-wire anemometry and the smoke visualization technique. Second, control of turbulent transition is tried by applying selective suction system considering the flow structure in the transition region. It is found that the most amplified disturbance at the last stage of the transition is the secondary instability f2. Therefore, it is concluded that turbulent transition in crossflow dominant boundary layer transition is driven by this secondary instability. Considering such transition flow structure, an effective technique for control of the transition is developed. Namely, by forming narrow streamwise suction slits along each streamwise crossflow vortex, appearance of the secondary instability is successfully delayed. Such a suction system has an advantage over a uniform suction system in that amount of suction air volume is much less than that for uniform suction, and far less energy is needed for transition control.
AB - Full turbulent transition is induced on a yawed flat plate with a displacement body system in a wind tunnel. First, the transition process is measured in detail using hot-wire anemometry and the smoke visualization technique. Second, control of turbulent transition is tried by applying selective suction system considering the flow structure in the transition region. It is found that the most amplified disturbance at the last stage of the transition is the secondary instability f2. Therefore, it is concluded that turbulent transition in crossflow dominant boundary layer transition is driven by this secondary instability. Considering such transition flow structure, an effective technique for control of the transition is developed. Namely, by forming narrow streamwise suction slits along each streamwise crossflow vortex, appearance of the secondary instability is successfully delayed. Such a suction system has an advantage over a uniform suction system in that amount of suction air volume is much less than that for uniform suction, and far less energy is needed for transition control.
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U2 - 10.1299/kikaib.63.849
DO - 10.1299/kikaib.63.849
M3 - Article
AN - SCOPUS:0031098259
VL - 63
SP - 849
EP - 856
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
SN - 0387-5016
IS - 607
ER -