Accession Number : ADA189608

Title :   Calculated Unsteady Aerodynamics of Wings.

Descriptive Note : Annual technical rept. May 86-Nov 87,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s) : McCune, James E

PDF Url : ADA189608

Report Date : 15 Dec 1987

Pagination or Media Count : 55

Abstract : Substantial advances in the analysis of the large-amplitude unsteady aerodynamics of wings have been achieved. Special focus has been placed on developing techniques for describing the exact non-linear convection, deformation, and roll-up of the vorticity wakes above and behind active wing surfaces. Using a combination of analytic and computer-interactive methods, new insights and more exact aerodynamic performance results have been generated. The effects of dissipative internal 'cores' in the overall 3D wake structures above deltas have been analyzed in the slender wing limit. New paths for further computer-assisted advances, including improved understanding of wing-wake interaction in severe maneuver, vortex core formation and break-up, and aerodynamic history effects have been charted. Papers are included on the following topics: Nonlinear aerodynamics of two-dimensional airfoils in severe maneuver; Interactive aerodynamics of wings in severe maneuver; Slender wing theory including regions of embedded total pressure loss; Keywords: Unsteady wing theory; Wake evolution; Vortex core evolution; Flight maneuvers; Unsteady wing loads; Flight loads.

Descriptors :   *WINGS, AERODYNAMIC CHARACTERISTICS, AERODYNAMIC FORCES, AERODYNAMICS, AMPLITUDE, COMPUTERS, CONVECTION, CORES, DEFORMATION, DISSIPATION, EVOLUTION(GENERAL), FLIGHT LOADS, FLIGHT MANEUVERS, HIGH RATE, HISTORY, INTENSITY, INTERACTIONS, INTERACTIVE GRAPHICS, INTERNAL, LIMITATIONS, LOSSES, MANEUVERS, NONLINEAR SYSTEMS, PATHS, PRESSURE, SLENDER BODIES, SURFACES, THEORY, UNSTEADY FLOW, VORTICES, WAKE

Subject Categories : Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE