Control of Boundary Layer on a Flat Plate by Means of Cavity Flow

  • Authors:

  • K. Aoki;H. Okanaga;Y. Nakayama

  • Affiliations:

  • Tokai University, Department of Mechanical Engineering, School of Engineering, 1117 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan.;Tokai University, Department of Mechanical Engineering, School of Engineering, 1117 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan.;Future Technology Research Institute, 3-56-2 Higashi-Oizumi, Nerima-ku, Tokyo 178-0063, Japan.

  • Venue:
  • Journal of Visualization
  • Year:
  • 2000

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Abstract

This paper describes the control of boundary layer on a flat plate by means of cavity flow. In this study, classifying the shapes of cavities into circular arc, rectangle and triangle makes the discussion, and the depths of the cavities are changed systematically. It is made clear, by numerical calculations and experiments, what states of flow are shown in the internal parts of cavities and what kinds of influence are exerted to the boundary layers in the upstream and downstream flows. As a result, the following facts are made clear. By taking up properly the depth ratios (k/c) of cavities complying with the individual cavity shapes, the boundary layer thickness in the flow upstream and downstream of the cavities can be controlled. Meanwhile with any of the cavities, the existence of the minimum boundary layer thickness (&b.delta;/&b.delta;_m )_min is seen at a depth ratio.