Improving the UAS-S4 Éhecal airfoil high angles-of-attack performance characteristics using a morphing wing approach. (January 2016)

• Record Type: Journal Article
• Authors: Gabor, Oliviu Şugar; Simon, Antoine; Koreanschi, Andreea; Botez, Ruxandra Mihaela
• Is Part Of: Proceedings of the Institution of Mechanical Engineers. Volume 230:Number 1(2016:Jan.)
• Page Start: 118
• Page End: 131
• Publication Date: 2016-01
• Subjects: Unmanned aerial system -- morphing wing -- high angles of attack -- boundary layer separation -- optimization; Aeronautics -- Periodicals; Astronautics -- Periodicals; Airplanes -- Design and construction -- Periodicals; Aerospace industries -- Periodicals; 629.1
• DOI: 10.1177/0954410015587725
• Languages: English
• ISSNs: 0954-4100

Abstract

In this paper, a morphing wing approach with a new methodology and its results for the high angles-of-attack optimization of the S4 unmanned aerial system airfoil are described. The boundary layer separation delay, coupled with an increase of the maximum lift coefficient, was achieved using an in-house optimization tool based on the artificial bee colony algorithm, coupled with the Broyden–Fletcher–Goldfarb–Shanno algorithm to provide a final refinement. The obtained results were validated with an advanced, multi-objective, commercially available optimizing tool. The aerodynamic calculations were performed using a two-dimensional linear panel method, coupled with an incompressible boundary layer model and a transition estimation criterion. For very small displacements of the airfoil surface, of less than 2.5 mm, lift coefficient increases of up to 18% together with relevant drag reductions have been achieved, successfully delaying separation for the high angles-of-attack range.