Study on the fundamental flow characteristics of synthetic jets(Behavior of free synthetic jets)

• NISHIBE Koichi

  Department of Mechanical Engineering, Tokyo City University

• FUJITA Yuki

  DMW Corporation

• SATO Kotaro

  Department of Innovative Mechanical Engineering, Kogakuin University

• YOKOTA Kazuhiko

  Department of Mechanical Engineering, Aoyamagakuin University

Abstract

Jet flows have been applied in numerous fields to control flow separation. Over the last decade, several studies on the production of synthetic jets have been performed. However, little information is available about a number of aspects concerning synthetic jets, including details of the structure and the formation mechanism of such jets. The present study attempts to clarify some of the fundamental flow characteristics of free synthetic jets on the basis of experiments and numerical simulations. Experimental velocity measurements and flow visualizations are performed using the hot-wire anemometer and the smoke wire method, respectively. It is found that both the temporal change in the flow pattern and the time-averaged velocity distribution at the centerline depend on K = ReU/S² (the ratio of the Reynolds number to the square of the Stokes number). The unsteady downstream flow characteristics are discussed in addition to the relation between the formative point of the synthetic jet and the value of K. Furthermore, the flow pattern and the unsteady flow characteristics of the synthetic jet are compared with those of a continuous jet.

Journal

• Journal of Fluid Science and Technology

  Journal of Fluid Science and Technology 9 (1), JFST0007-JFST0007, 2014

  The Japan Society of Mechanical Engineers

Keywords

• Synthetic jet
• Continuous jet
• Free jet
• Velocity distribution
• Jet formation
• Smoke wire method
• Unsteady flow
• Turbulence

Details

• CRID: 1390282680222779008
• NII Article ID: 130004480041
• DOI: 10.1299/jfst.2014jfst0007
• ISSN: 18805558
• Web Site: https://www.jstage.jst.go.jp/article/jfst/9/1/9_2014jfst0007/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed