Computational Study of Effects of Nondimensional Parameters on Synthetic Jets

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  • OKADA Koichi
    Department of Ocean and Space Engineering, Division of Systems Integration, Graduate School of Engineering, Yokohama National University Currently, Engineering Solution Division, Ryoyu Systems Co., Ltd.
  • OYAMA Akira
    Department of Space Transportation Engineering, Institute of Space and Astronautical Science/Japan Aerospace Exploration Agency
  • FUJII Kozo
    Department of Space Transportation Engineering, Institute of Space and Astronautical Science/Japan Aerospace Exploration Agency
  • MIYAJI Koji
    Division of Systems Research, Faculty of Engineering, Yokohama National University

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This paper investigates the effects of nondimensional parameters on the characteristics of synthetic jets. Flow inside the synthetic jet cavity and orifice, the flow outside are simulated together using large-eddy simulations (LES). A comparison of the present results and those of the experiment shows that simulating the flow both inside and outside the jet cavity is essential for accurately estimating the velocity and velocity fluctuations of the synthetic jet. LES results under various flow conditions show that strong three-dimensional vortices are generated when the Reynolds number is large, but finer vortex structures form because of stronger vortex interaction as the Strouhal number increases.

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