Abstract
Separation is mostly an undesirable phenomenon and therefore boundary layer control is an important technique for flow separation problems on airfoils and in diffusers. Longitudinal (streamwise) vortices are produced by the interaction between jets and a freestream. This technique for separation or stall control is known as the vortex generator jet method. The vortex generator jet method is an active control technique which provides a time-varying control action to optimize performance under a wide range of flow conditions. In this study, an active separation control system using vortex generator jets with rectangular orifices (aspect ratio: 6.4) has been developed. The active separation control system can be practically applied to the flow separation control of a two-dimensional diffuser. It was confirmed that our active separation control system could adaptively achieved by some changes in freestream velocity and the divergence angle of the test section.
