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The Influence of an Asymmetric Slot on the Flow Characteristics of Synthetic Jets

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Proceedings of the 5th International Conference on Jets, Wakes and Separated Flows (ICJWSF2015)

Part of the book series: Springer Proceedings in Physics ((SPPHY,volume 185))

Abstract

The purpose of this paper is to elucidate the influence of an asymmetric slot on the flow characteristics of synthetic jets. In this study, the relation between flow characteristics of two-dimensional synthetic jets and beak-shaped asymmetric slots is investigated experimentally and numerically. Results clarify that the vortex pair with different x-direction locations induced by the asymmetric slot produces a large-scale circulation region on the opposite side of the beak in the case of long beaks. It is also demonstrated that flow fields for synthetic jets depend on asymmetric slot beak length; in contrast, continuous jets are independent of asymmetric slot beak length.

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Abbreviations

b 0 :

Slot width [m]

L 0 :

Stroke length [–]

C :

Non-dimensional beak length [–]

Re :

Reynolds number [–]

U 0 :

Downstream-directed average exit nozzle jet velocity [m/s]

|u|:

Absolute value of the velocity  = [u 2 + v 2]1/2

|u max|:

Maximum value of velocity

References

  1. R. Holman, Y. Utturkar, Formation criterion for synthetic jets. AIAA J. 43(10), 2110–2111 (2005)

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  2. T. Koso, T. Kinoshita, Jet flow formation using an annular synthetic jet actuator, in JSME Annual Meeting (2006), pp. 211–212

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  3. R. Duvigneau, A. Hay, M. Visonneau, Optimal location of a synthetic jet on an airfoil for stall control. J. Fluid Eng. 129, 825–833 (2007)

    Article  Google Scholar 

  4. C. Nakagawa, K. Nishibe, S. Okayasu, K. Sato, K. Yokota, Experimental study of synthetic jet on a circular cylinder. JSME 46, 531–532 (2009) (in Japanese)

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Acknowledgments

The authors would like to thank Mr. Junichiro Kikkawa of Software Cradle Co., Ltd. for his help with the numerical simulations. The present study was carried out with the support of MEXT (Functional Microstructured Surfaces Research Center of Kogakuin University) and Grants-in-Aid for Scientific Research 15K05807.

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Authors and Affiliations

  1. Graduate School of Mechanical Engineering, Kogakuin University, Nishi-Shinjuku 1-24-2, Shinjuku-ku, Tokyo, 163-8677, Japan

    Yusuke Watabe

  2. Department of Mechanical Engineering, Kogakuin University, Nishi-Shinjuku 1-24-2, Shinjuku-ku, Tokyo, 163-8677, Japan

    Kotaro Sato

  3. Department of Mechanical Engineering, Tokyo City University, Tamazutsumi 1-28-1, Setagaya-ku, Tokyo, Japan

    Koichi Nishibe

  4. Department of Mechanical Engineering, Aoyama Gakuin University, Fuchinobe 5-10-1, Chuo-ku, Sagamihara-shi, Kanagawa, Japan

    Kazuhiko Yokota

Authors
  1. Yusuke Watabe
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  2. Kotaro Sato
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  3. Koichi Nishibe
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  4. Kazuhiko Yokota
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Corresponding author

Correspondence to Kotaro Sato .

Editor information

Editors and Affiliations

  1. Stockholm, Sweden

    Antonio Segalini

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© 2016 Springer International Publishing Switzerland

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Watabe, Y., Sato, K., Nishibe, K., Yokota, K. (2016). The Influence of an Asymmetric Slot on the Flow Characteristics of Synthetic Jets. In: Segalini, A. (eds) Proceedings of the 5th International Conference on Jets, Wakes and Separated Flows (ICJWSF2015). Springer Proceedings in Physics, vol 185. Springer, Cham. https://doi.org/10.1007/978-3-319-30602-5_13

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