Strake Effects On the Turbulent Fin Flowfield Of a High-Performance Fighter Aircraft
Experimental results for the low-speed fin flow environment of a canard-delta fighter configuration are presented. In particular, the investigation deals with the influence of small forebody strakes on the fin buffet situation. Using advanced hot-wire techniques instantaneous velocities are measured resulting in detailed flowfields of mean, rms and spectral quantities. Various angles of attack at nonsymmetric freestream are tested at a Reynolds number of about 1 million. Especially at sideslip and high incidence, a strong interaction between strake and canard vortex systems hampers the inboard movement of the burst windward wing leading-edge vortex. Consequently, the turbulence intensities at a center-line fin station are substantially lower for the strake-on compared to the strake-off configuration. Moreover, the observed narrow-band concentration of turbulent kinetic energy is also less severe that the excitation level on fin structural modes is reduced.
KeywordsVortex System Turbulent Shear Stress Wing Vortex Aerodynamic Chord AIAA Atmospheric Flight Mechanics
Unable to display preview. Download preview PDF.
- Ferman, A., Patel, S. R., Zimmermann, N. H., and Gerstenkorn, G.: A Unified Approach to Buffet Response of Fighter Aircraft Empennage. AGARD-CP-483, Aircraft Dynamic Loads Due to Flow Separation, Sorrento, Italy, 1990, pp. 2–1–2–18.Google Scholar
- Breitsamter, C: Turbulente Strömungsstrukturen an Flugzeugkonfigurationen mit Vorderkantenwirbeln. Dissertation, Technische Universität München, 1997.Google Scholar
- Shah, G. H: Wind Tunnel Investigation of Aerodynamic and Tail Buffet Characteristics of Leading-Edge Modifications to the F/A-18. AIAA Atmospheric Flight Mechanics Conference, AIAA Paper 91-2889, Aug. 1991.Google Scholar
- Becker, J., and Luber, W.: Comparison of Piezoelectric Systems and Aerodynamic Systems for Aircraft Vibration Alleviation. SPIE Conference ”Smart Structures and Materials”, San Diego, March 1998.Google Scholar