The dynamic behavior of modern fighter aircraft depends more and more on unsteady aerodynamics. Until recently, the designer concentrated on classical problems such as aeroelasticity and flutter. Dynamic stability parameters were most often determined by low angle-of-attack calculation methods, without much recourse to experiment. The results obtained from the few dynamic experiments performed were used to confirm the absence of problems rather than as design parameters. New requirements for fighter aircraft performance include the ability to fly at high angles of attack in the presence of extensive regions of separated or vortical flows, relaxed static stability, greatly increased agility, and an interest in unorthodox geometries such as closely-coupled-canard or tail-first configurations. The time lags and unsteady phenomena associated with flow fields resulting from rapid maneuvers and large amplitude motions significantly affect the dynamic behavior of modern fighter aircraft and become as important for aircraft design as the classical static performance criteria. A review is made of the various aerodynamic aspects affecting aircraft dynamic behavior, followed by a survey of the most pertinent experimental techniques.
Aircraft Dynamics: Aerodynamic Aspects and Wind Tunnel Techniques
1987
30 pages
Report
Keine Angabe
Englisch
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