A Study of Interaction of a Pair of Longitudinal Vortices with a Horseshoe Vortex around a Wing. 2nd Report. Behavior of the Interacting Flow Field Controlled Passively.

This paper presents the behavior of a passively controlled horseshoe vortex at the root of NACA 0024 wing which is established on a turbulent boundary layer. A pair of vortex generators of half delta wing is installed upstream of the wing. The flow field of the optimally controlled horseshoe vortex both in case of Common Flow Up (CFUC) and Common Flow Down Configuration (CFDC) is carefully investigated by an X-array hot-wire. In case of CFUC, the horseshoe vortex is not shifted from the wing, because the longitudinal vortex is restrained. The interacted vortex presents a circular profile, in a optimally controlled case. In case of CFDC, the interacted vortex that has strong vorticity by the pairing process is shifted away from the wing. Then, the high momentum fluid flow penetrates between the wing and the vortex.