Accession Number : ADP006224

Title :   Unsteady Aerodynamic Forces on an Oscillating Wing at High Incidences and Flow Separation,

Corporate Author : DEUTSCHE FORSCHUNGSANSTALT FUER LUFT- UND RAUMFAHRT GOETTINGEN (GERMANY F R)

Personal Author(s) : Foersching, H. W.

Report Date : SEP 1990

Pagination or Media Count : 18

Abstract : Based on wind tunnel measurements on a low-aspect-ratio trapezoidal half-wing model in incompressible flow, some characteristic features of motion-induced unsteady airloads at high incidences and flow separation are presented and discussed. Special emphasis is placed on the effect of the motion of the wing on the flow separation processes and on the investigation of the interactions between the separated flow phenomena on the stationary wing and the motion-induced unsteady airloads on the oscillating wing. It is shown that these air-loads are strongly affected by the flow separations and that their prediction from inviscid potential-flow theory may lead to rather unrealistic results in buffeting response calculations.

Descriptors :   *AERODYNAMIC LOADING, *SWEPT WINGS, AERODYNAMIC FORCES, ANGLE OF ATTACK, FLOW SEPARATION, INCOMPRESSIBLE FLOW, UNSTEADY FLOW, BUFFETING, DYNAMIC RESPONSE, MATHEMATICAL PREDICTION, WIND TUNNEL TESTS, WEST GERMANY.

Subject Categories : Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE