| Popis: |
Using nose-mounted micro-structures, it was shown experimentally and computationally in earlier publications by the authors that signiflcant side force could be generated at moderate angles-of-attack and for supersonic ∞ow on a generic missile conflguration. Under these ∞ow conditions, a \clean" slender body does not usually experience any lateral or side forces. In the current study, additional numerical simulations were performed in order to determine the mechanism by which the nose-mounted micro structures contribute to the generation of a side force at moderate angles-of-attack. The computational results show that the presence of the micro-structure on the nose contributes to the formation of a vortex that eventually merges with one of the two standard counter-rotating leeside vortices that form when a slender body is placed at angle-of-attack. The ∞ow efiector shed vortex being much stronger than the leeside ∞ow separation generated vortex, entrains the latter one to eventually merge into a single stronger vortex. The newly formed vortex, being stronger than the opposite side vortex, is forced to move upward above the missile’s leeside. In turn, this results in higher surface pressure on that side of the missile and hence the formation of a side force. |
