Full-scale wind-tunnel studies of F/A-18 tail buffet

Autor:	Kevin D. James, Larry A. Meyn
Rok vydání:	1996
Předmět:	Engineering Fin Angle of attack business.industry Aerospace Engineering Leading-edge extension Aerodynamics Structural engineering Mechanics Wind speed symbols.namesake Mach number Bending moment symbols business Wind tunnel
Zdroj:	Journal of Aircraft. 33:589-595
ISSN:	1533-3868 0021-8669
DOI:	10.2514/3.46986
Popis:	Tail buffet studies were conducted on a full-scale, production F/A-18 fighter aircraft in the 80 by 120 ft Wind Tunnel at NASA Ames Research Center. The F/A-18 was tested over an angle-of-attack range of 18-50 deg, and at wind speeds of up to 168 ft/s, corresponding to a Reynolds number of 12.3x10(exp 6) based on mean aerodynamic chord and a Mach number of 0.15. The port, vertical tail fin was instrumented and the aircraft was equipped with a removable leading-edge extension (LEX) fence. Time-averaged, power-spectral analysis results are presented for the tail fin bending moment derived from the integrated pressure field, for the zero side-slip condition, both with and without the LEX fence. The LEX fence significantly reduces the magnitude of the rms pressures and bending moments. Scaling issues are addressed by comparing full-scale results for pressures at the 60%-span and 45%-chord location with small-scale, F/A-18 tail-buffet data. The comparison shows that the tail buffet frequency scales very well with length and velocity. Root-mean-square pressures and power spectra do not scale as well. The LEX fence is shown to reduce tail buffet loads at all model scales.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::df7dad9ebfe973be901c2c73f8f9b5ea https://doi.org/10.2514/3.46986 Zobrazit plný text záznamu