Transition control in a flat-plate boundary layer

Seiichiro Izawa, Takeshi Sakai, Ayumu Inasawa, Ao Kui Xiong, Yu Fukunishi

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Citation (Scopus)

Abstract

A semi-automatic and active control of T-S waves and oblique waves is performed using an array of piezo-ceramic actuators attached on a flat-plate surface. The actuators generate counter waves to 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. It is shown that the system could weaken these waves when their sweep angles are less than 15 degrees. However, it has difficulty in controlling the waves of large sweep angles. Through the results from the experiment activating only one actuator, it is shown that the difficulty arises because the wave front of the waves generated by each actuator deforms into an arch.

Original languageEnglish
Title of host publicationSixth IUTAM Symposium on Laminar-Turbulent Transition
EditorsRAMA GOVINDARAJAN
Pages207-212
Number of pages6
Publication statusPublished - 2006 Dec 1

Publication series

NameFluid Mechanics and its Applications
Volume78
ISSN (Print)0926-5112

Keywords

  • Active control
  • Boundary layer
  • Feedback
  • Piezo actuator
  • Transition

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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  • Cite this

    Izawa, S., Sakai, T., Inasawa, A., Xiong, A. K., & Fukunishi, Y. (2006). Transition control in a flat-plate boundary layer. In RAMA. GOVINDARAJAN (Ed.), Sixth IUTAM Symposium on Laminar-Turbulent Transition (pp. 207-212). (Fluid Mechanics and its Applications; Vol. 78).