The dynamic behavior of aircraft in high performance maneuvres is greatly affected by various unsteady flow phenomena, particularly at high angles of attack, where extensive regions of separated flow and several systems of symmetric vortices are often present. Such flows, already rather complex in steady flight, become even more involved in oscillatory or high rate-of-turn flight, where the time lags associated with the various vortical and separated flows become a significant factor affecting profoundly both the static and the dynamic aerodynamic parameters of the aircraft. A good understanding of unsteady aerodynamics is also important for design of advanced flight control systems, prediction of wing structural and maneuvre loads and buffet prediction. This symposium examined recent advances in the methods for experimental and computational prediction of non-linear flow phenomena in unsteady aerodynamics and of stability parameters required to describe adequately the dynamic behavior of aircraft will special emphasis on high-angle-of-attack situations. The major program topics were: (1) Unsteady aerodynamics, (2) Dynamic stability parameters, and (3) Applications to aircraft Dynamics. In the first part, topics such as unsteady boundary layers, unsteady separation and stall, buffeting and unsteady airloads were discussed. The second part covered wind-tunnel and flight-test techniques, with special emphasis on the measurement of non-linearities, aerodynamic cross-coupling, hysteresis and time-dependent effects. In part three, various applications of the above to the actual prediction of aircraft dynamics were described, including topics such as mathematical modelling, bifurcation theory, prediction of wing rock, advanced control systems, etc.
Unsteady Aerodynamics - Fundamentals and Applications of Aircraft Dynamics. Conference Proceedings of the Joint Symposium of the Fluid Dynamics and Flight Mechanics Panels Held in Goettingen, Federal Republic of Germany on 6-9 May 1985
1985
625 pages
Report
Keine Angabe
Englisch
Aerodynamics , Symposia , Unsteady flow , Vortices , Boundary layer , Turbulent flow , Flight maneuvers , Flow separation , Angle of attack , High angles , Oscillation , Turning flight , Aerodynamic loading , Buffeting , Flight loads , Nonlinear systems , Stalling , Flight control systems , Mathematical prediction , Foreign technology , Unsteady aerodynamics , Computational aerodynamics , Dynamic stall , Aircraft dynamics , Flight dynamics , Nonlinear flow , Bifurcation theory , Dynamic stability , NATO furnished , Compilation reports