Abstract

The extension of the aircraft's performance envelope into the high angle of attack regime carries with it the penalty of undesirable flow instabilities. At these conditions the aircraft flow-field is complex, with extensive regions of highly separated unsteady flow which is more pronounced in the case of the vertical tail or fin. The excitation given to a structure by separated flows is termed as ‘Buffet’ and the response of the structure to this excitation is known as ‘buffeting’. In the present study an attempt is made to quantify the Buffet load spectrum from experimental data and determine the response of the vertical tail of a typical combat aircraft under this load and thereby establishing a broad procedure for buffet clearance.

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