Control of the separated-and-reattaching flow over either a backward-facing step or a cavity by film actuators

Satoshi Kikuchi, Yu Fukunishi

Research output: Contribution to journalArticlepeer-review

Abstract

An experimental investigation aimed at controlling the separated-and- reattaching flows over either a backward-facing step or a cavity is carried out. Thin film actuators, attached to the step surface at the edge, are used for the control. Experimental results show that this system is capable of controlling the separation flow of a backward-facing step when the freestream velocity is under 15m/s. The phase of the separation can be altered in the spanwise direction. The effect of the control is preserved past the reattachment point. Elowever, the systematic pattern of velocity fluctuation cannot be maintained when the freestream velocity is higher. For the flow over a cavity, the flow is controllable when the freestream velocity is low. However, at a high freestream velocity (20 m/s), the uniform phase mode becomes dominant and the flow becomes difficult to control.

Original languageEnglish
Pages (from-to)4037-4043
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume64
Issue number628
DOIs
Publication statusPublished - 1998 Dec

Keywords

  • Backward-facing step
  • Cavity
  • Flow control
  • Piezo film
  • Separation
  • Unsteady flow

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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