Strake Effects On the Turbulent Fin Flowfield Of a High-Performance Fighter Aircraft

  • C. Breitsamter
Part of the Notes on Numerical Fluid Mechanics (NNFM) book series (NONUFM, volume 72)


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.


Vortex System Turbulent Shear Stress Wing Vortex Aerodynamic Chord AIAA Atmospheric Flight Mechanics 
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Copyright information

© Springer Fachmedien Wiesbaden 1999

Authors and Affiliations

  • C. Breitsamter
    • 1
  1. 1.Lehrstuhl für FluidmechanikTechnische Universität MünchenGarchingGermany

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