Accession Number : ADP006227

Title :   Interaction between the Canard and Wing Flows on a Model of a Typical Combat Aircraft,

Corporate Author : ROYAL AEROSPACE ESTABLISHMENT BEDFORD (UNITED KINGDOM)

Personal Author(s) : Mabey, D. G. ; Welsh, B. L. ; Pyne, C. R.

Report Date : SEP 1990

Pagination or Media Count : 19

Abstract : The main features of canard/wing interaction were established by a comprehensive test of a half model of a typical combat aircraft in the RAE 13ft x 9ft Low Speed Wind Tunnel. The measurements comprised overall steady forces, buffeting on the wing and the canard, and steady and unsteady pressure distributions on the wing. Results show that the canard effective incidence (determined by the canard setting and the body/wing upwash) controls the canard/wing interaction. With attached flow the canard produces downwash field which has significant effects when the wing flow is attached. With separated flow on the canard, the downwash field is still produced but there is also vigorous mixing which inhibits development of wing flow separations, increasing the overall lift, reducing the wing buffeting and reducing the drag. The process by which this favourable effect is achieved is illustrated by analysis of the steady and unsteady pressure distributions on the wing at three spanwise sections. These results have important implications with respect to the development and optimisation of other canard/wing configurations, particularly at high angles of incidence.

Descriptors :   *CANARD CONFIGURATIONS, *WINGS, *BUFFETING, FLOW SEPARATION, INTERACTIONS, AIR FLOW, ANGLE OF ATTACK, PRESSURE DISTRIBUTION, DOWNWASH, MILITARY AIRCRAFT, WIND TUNNEL MODELS, GREAT BRITAIN.

Subject Categories : Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE