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Study on the Flow Characteristics of Synthetic Jets Near a Rigid Plane Boundary

[+] Author Affiliations
Ryota Tsunoda, Koichi Nishibe, Yuki Fujita, Kotaro Sato

Kogakuin University, Tokyo, Japan

Kazuhiko Yokota

Aoyama Gakuin University, Sagamihara, Kanagawa, Japan

Toru Koso

Kyushu University, Kasuga, Fukuoka, Japan

Paper No. AJK2011-16032, pp. 2993-2998; 6 pages
  • ASME-JSME-KSME 2011 Joint Fluids Engineering Conference
  • ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D
  • Hamamatsu, Japan, July 24–29, 2011
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-4440-3
  • Copyright © 2011 by JSME


The jet flows have been applied to various fields to control the flow separation. Over the last decade, several studies have investigated synthetic jets. However, there are still many clarifications needed, including details of the structure and Coanda effect of synthetic jets. The present study clarifies some fundamental flow characteristics of free synthetic jets and synthetic jets near a rigid boundary by conducting an experiment and numerical simulations. As the main results, it is found that the velocity distribution of free synthetic jets depends on K = Re/S2 (the ratio of the Reynolds number to the square of the Stokes number) and can be identified by the maximum velocity at the centerline and the jet half-width. Flow visualization is carried out applying the smoke wire method. In addition, it is confirmed that the flow characteristics of the synthetic jet near a rigid boundary and re-attachment length of the synthetic jet are determined not only by H1 /b0 (normalized step heights) but also K.

Copyright © 2011 by JSME
Topics: Flow (Dynamics) , Jets



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