Why is LEX Vortex Breakdown on the F/A-18 Configuration Insensitive to Reynolds Number?

摘要: The insensitivity to Reynolds number of the LEX vortex breakdown and interaction on F/A-18 aircraft configuration over complete Re-range from water tunnel tests full-scale flight contrasts sharply high sensitivity displayed by delta-wing configurations. An analysis indicates that this is due in equal parts Gothic apex geometry planform "viscous fairing" effects fuselage-induced upwash at leading edge downstream apex. Additionally, an effective sweep angle increase, induced viscousfairing effects, tends compensate for lack a compressibility effect tunnel. Consequently, even though neither nor Mach are simulated results roughly comparable test data high-alpha, low-Mach-number regime.