查看文章

The air-jet vortex generator (AJVG) consists of a small jet of air emerging from an aerodynamic surface that is pitched and yawed relative to the local freestream flow direction. It may be considered smart in the sense that it can be turned on and off to suit the aerodynamic need and, unlike the vane vortex generator (WG), poses virtually no drag penalty when quiescent.

The jet induces local boundary layer and freestream flow to form a well-organised, turbulent, helical structure as the combined flow penetrates downstream. We may set up an array of such AJVG devices, as with WGs, to produce a system of either corotational or contra-rotational vortices whose mixing actions can sustain viscous flow through severe adverse pressure gradients. This jet system of vortices possesses “powered” helices and cores of momentum excess and encourages the persistence of the vortices downstream. The vortices from the sharp …