Affiliations: 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.
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.