ACTIVE SYSTEM FOR EARLY DESTRUCTION OF TRAILING VORTICES

摘要

An active control method and apparatus for encour-agingthe early destruction of trailing vortices formed by alifting body having at least two control surfaces (68, 70) oneach side and creating multiple vortex pairs is provided. Themethod includes actuating the control surfaces in a mannerleading to the direct excitation of one or more of theTran-sient Growth Mechanism, the Short Wavelength Instability,the Long Wavelength Instability, and the Crow Instabilityto result in the accelerated breakup of the trailing vortices.A method of selecting control parameters in an activecon-trol system includes identifying the near-field vorticitydis-tribution of the aircraft, selecting at least one amplificationmechanism for distorting the trailing vortices, determiningamplitudes and wavelengths for imposed vortex perturba-tions,simulating trailing vortex evolutions, determiningef-fectiveness of perturbations and amplification mechanisms,determining vortex positions as a function of control surfacedeflections, and determining control parameters to governthe movement of the wing control surfaces.