Nonlinear Vortex Interactions On Wing Canard Configurations

Download or read book Nonlinear Vortex Interactions on Wing-Canard Configurations written by David Finkleman and published by . This book was released on 1971 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Close-coupled wing-canard configurations are ideally suited to applications in which high aircraft maneuverability is required at moderate speeds. The SAAB Viggen has exploited the advantages of placing canard and wing close together, but no theory has been capable of predicting the aerodynamics of this aircraft. In this investigation Sacks' method of simulating vortex sheets with distributions of discrete vortices has been applied to the study of the interaction of a slender wing with a nearly canard surface. The canard is detrimental to both lift and static longitudinal stability. The extent of canard wake roll-up is important in the interaction, and the flatter the wake the more adverse is the interaction. Downward canard deflection may lead to increases in lift of the entire configuration, and it is observed that for small vertical separations between the surfaces the forward portion of the wing is ineffective in producing lift. It is demonstrated that the canard can directly affect the pressure distribution on the wing and application of this configuration to direct lift control and control configured aircraft are noted. (Author).