High Incidence Buffet Flow over Fighter Type Aircraft
Fin buffet loads of a fighter type delta canard configuration with 50 ° swept wing were measured at sideslip angles of β = 0 °, 5 ° and 10 ° covering the full angle of attack range up to α = 90 °. The RMS-values of the fin surface pressure fluctuations and related power spectral densities are presented and used to discuss the influence of various flow features. A known relation based on wing sweep angle and angle of attack for the dominant frequency associated with helical vortex breakdown showed good agreement with measured frequencies at β = 0 ° and β = 5 ° while at β = 10 ° holds only for the windward side.
KeywordsPower Spectral Density Windward Side Vortex Breakdown Sideslip Angle Lead Edge Vortex
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