Summary  
 

• Peak spectral intensity reductions are achievable on the F-15 for all angles of attack, with more than a 60% reduction at the most intense buffet angle.

• There is only a limited region on the wing surface where fences are effective.

• Fences at a single location remain effective with increases in AOA and freestream velocity.

•  F-15 tail buffet is shown to be driven by the small amplitude, narrow-band fluctuating nature of the flow field and not by intense broad-band turbulence.

• Fences are effective in reducing narrow-band fluctuations.

• Empirical prediction of excitation frequencies from small-scale, low speed tests is presented for three fighter aircraft configurations along with four delta wing models.

   F-15 Tail Buffet Alleviation Results   Introduction:    Spectral Amplification:    Centrifugal Instabilities: Reduced Frequency Scaling:    Linear Peak Frequency/Velocity Slopes:    Models Tested: Empirical Peak Frequency Data:    Surface Fence Tests:    Reduction in Spectral Intensity: Reductions Over all Angles:    Comparison with Flight Tests:    Summary: Future F-15 Wind Tunnel Tests: Home: