Accession Number : ADA319456

Title :   Cooperative Programme on Dynamic Wind Tunnel Experiments for Manoeuvring Aircraft (Programme en Cooperation sur L'Experimentation Dynamique en Soufflerie pour la Manoeuvrabilite de l'Avion).

Corporate Author : ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)

PDF Url : ADA319456

Report Date : OCT 1996

Pagination or Media Count : 247

Abstract : This report describes a multinational cooperative programme set up by the AGARD Fluid Dynamics Panel in response to the continuing interest among the NATO countries in dynamic wind tunnel testing. Such testing is essential for obtaining the aerodynamic information required to predict the behaviour of an aircraft performing angular motions. At low angles of attack this occurs primarily when the aircraft performs a small-amplitude oscillatory motion resulting from a disturbance or a control deflection. The dynamic stability can then be predicted by solving linear equations of motion in which the aerodynamic reactions are represented by the so called stability derivatives, obtainable from oscillatory experiments. At high angles of attack this occurs when the aircraft is involved in a spin, in which case rotary-balance data are required, or performs a rapid manoeuvre, in which case both rotary-balance and large- amplitude oscillatory data are needed. Such data are often nonlinear and time dependent, compounding the complexity of the prediction and analysis. The programme consisted of a series of dynamic experiments on models of a schematic combat aircraft configuration and of two generic aircraft forebodies. Ten wind tunnel facilities in seven countries were involved. The primary objectives were: (1) to examine the reliability of test techniques and (2) to obtain a data base for dynamic data at high angles of attack. Whenever possible, flow visualization experiments were included to gain a better understanding of the complex flow fields involved.

Descriptors :   *WIND TUNNEL TESTS, *JET FIGHTERS, *FLIGHT MANEUVERS, *DYNAMIC TESTS, DATA BASES, NATO, CONTROL, STABILITY, MANEUVERABILITY, EQUATIONS OF MOTION, AIRCRAFT, PREDICTIONS, DYNAMICS, PANELS, DEFLECTION, TEST METHODS, ANGLE OF ATTACK, FLOW VISUALIZATION, PROBLEM SOLVING, TIME, RELIABILITY, FLOW FIELDS, NONLINEAR SYSTEMS, FRENCH LANGUAGE, FLUID DYNAMICS, AMPLITUDE, OSCILLATION, TEST FACILITIES, AERODYNAMICS, ANGULAR MOTION, HIGH ANGLES, LINEAR ALGEBRAIC EQUATIONS.

Subject Categories : Attack and Fighter Aircraft
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE