Abstract
A semi-automatic and active control of T-S waves and oblique waves in a transitional flat plate boundary layer is carried out in a wind-tunnel experiment and a numerical simulation. An array of piezo-ceramic actuators attached on a surface is used to generate counter waves that cancel the incoming instability waves. The actuator’s operating amplitudes and phases are successively updated using the velocity fluctuations monitored downstream by a rake of hotwires. Experimental results show that the system is effective in weakening these waves when their inclination angles are less than 15 degrees. However, the system encountered difficulty in controlling the waves of large inclination angles. In the numerical simulation, it is shown that the control can be accomplished much easier. The numerical results show that controllability of the large inclination angle waves can be improved by shortening the spanwise length each actuator piece. The danger of pursuing this kind of research solely by a numerical simulation is pointed out.
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Yu Fukunishi: He received his M.Sc. (Eng) in 1979 from University of Tokyo and his Ph.D. in 1982 from the same university. He worked as an NRC researcher at NASA/Ames Research Center from 1984 through 1986. He worked as a research associate at Tokyo Institute of Technology for three years before he moved to Tohoku University. He became an associate professor of Tohoku University next year, and currently is a professor. His research interests are turbulence, transition of a boundary layer, flow control, aerodynamic noise suppression, and SPH simulation.
Takeshi Sakai: He received his M.Sc. (Eng) in 2004 from Tohoku University (Department Mechanical Systems and Design). The title of his master’s thesis was “Active control of a transitional flat plate boundary layer using piezo-ceramic actuators”. Now he works for Hokkaido Railway Company.
Kazuya Sasaki: He is a master course student in the Department of Mechanical Systems and Design. Tohoku University.
Seiichiro Izawa: He received his M.S. degree in 1997 and obtained Ph.D. in 2000 from Hokkaido University. He works as a research associate at Department of Mechanical Systems and Design. Tohoku University since 2001. His research interests include shear flows, aerodynamic noise and flow control.
Ao-Kui Xiong: He received M.S. degree in 1985 from Wuhan University of Transportation, China. He obtained his Ph.D. in science from Peking University, China. He worked as a research associate at Wuhan University of Science and Technology from 1985 and worked as an associate professor from 1995 through 2001. He works as an associate professor of Department of Mechanical Systems and Design. Tohoku University since 2002. His research interests include: theoretical analysis of turbulence and Lattice Boltzmann Method.
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Fukunishi, Y., Sakai, T., Sasaki, K. et al. Feedback control of instability waves in a transitional flat-plate boundary layer. J Vis 9, 283–289 (2006). https://doi.org/10.1007/BF03181675
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DOI: https://doi.org/10.1007/BF03181675