COMPUTATION OF F A-18 TAIL BUFFET

Citation
K. Gee et al., COMPUTATION OF F A-18 TAIL BUFFET, Journal of aircraft, 33(6), 1996, pp. 1181-1189
Citations number
21
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Aerospace Engineering & Tecnology
Journal title
ISSN journal
0021-8669
Volume
33
Issue
6
Year of publication
1996
Pages
1181 - 1189
Database
ISI
SICI code
0021-8669(1996)33:6<1181:COFATB>2.0.ZU;2-Z
Abstract
The aerodynamic loads that cause tail buffet on the F/A-18 fighter air craft were analyzed using computational fluid dynamics (CFD). The half -body aircraft geometry was modeled using an overset grid system, whic h included the fuselage, wing, wing leading-edge extension (LEX), defl ected wing leading-edge flap, inlet geometry, and vertical and horizon tal tails, Time-accurate solutions with and without the LEX fence were obtained at an high-angle-of-attack flight condition, Time histories of the surface pressures on the rigid vertical tail were computed, The vertical tail root bending moment and side force time histories were obtained from the surface pressure distributions, Power spectral densi ty analysis of the time histories were computed, Results were compared with experimental data from subscale and full-scale wind-tunnel tests , The current grid system yielded results that agree quite well with e xperimental data, The CFD solution predicted the unsteady rms pressure coefficient, the peak power, and the favorable effect of the LEX fenc e on these quantities. These results indicated that current CFD method s can be used to predict tail buffet and can be a useful tool for anal yzing similar problems in aircraft design.