Passive Control on a Supersonic Annular Cavity Flow

The mode of a supersonic flow around a cavity depends on the parameters of the incoming flow and the geometry of the cavity. In a certain range of ratios between the length and depth of the cavity, both open and closed flow modes in the cavity are possible. An important practical problem is to find ways to control the flow modes in the cavity, and in particular, ways to expand the region of favorable open flow modes. This paper presents the results of an experimental study of a supersonic flow around an annular cavity formed by a coaxial conical tip and a cylindrical body connected by a cylindrical rod. A perforated interceptor is used to control the flow mode in the cavity at different angles of the tip cone. With a continuous change in the length of the cavity in the flow, the boundaries of the regions of the single-mode and multimode cavity flow are determined. The data obtained show the possibility of significantly expanding the region of the fopen flow mode in the cavity.