1. F/A-18C to E wing morphing study for the abrupt-wing-stall program
- Author
-
Green, Bradford E. and Ott, James D.
- Subjects
Airplanes -- Wings ,Airplanes -- Research ,Aerospace and defense industries ,Business ,Science and technology - Abstract
In an effort to determine the impact of various wing parameters on the abrupt-wing-stall phenomenon encountered by the preproduction F/A-18E, various characteristics of the F/A-18C wing were modified to reflect the design changes incorporated into the F/A-18E wing. The parameters evaluated during this computational study included thickness, camber, twist, leading-edge radius, leading-edge flap-chord ratio, and the addition of a leading-edge snag. After modifying the wing parameters independently and then in combination, a computational-fluid-dynamics flow solver was used to evaluate the computational grids. A figure of merit was then used to determine the impact of the various wing parameters on the abrupt stall. Several potential computational figures of merit were evaluated to determine their utility for the prediction of an abrupt wing stall. One of the most promising figures of merit for indicating the onset of an abrupt stall was found to be the wing-root bending-moment coefficient. Using this figure of merit, it was determined that the incorporation of a leading-edge snag, the reduction of leading-edge flap-chord ratio and the elimination of camber are the likely contributors to the abrupt-stall phenomenon encountered by the aircraft.
- Published
- 2005