Prediction and Control of Twin-Tail Buffet of Fighter Aircraft

Abstract : High-fidelity multidisciplinary analysis capabilities for the prediction and control of tail buffeting of fighter aircraft have been developed and extensively validated for the F/A-18 aircraft. The computational results compared very well with flight and several experimental data. The results indicated that the vertical tail is subject to both bending and torsional responses, mainly in the first mode. The buffet excitation peaks shift to lower frequency as the angle of attack increases. Capabilities for buffet alleviation have been demonstrated using LEX fences and vortical blowing. A parametric study for both the active and passive flow control has been conducted. Capabilities for actively controlling the vertical tail structure have been demonstrated by strengthening the F/A-18 vertical tail using piezoelectric actuators.

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