Accession Number : AD0873253
Title : Measurement of Aerodynamic Forces on an Oscillating Airfoil
Descriptive Note : Final engineering rept.
Corporate Author : MARYLAND UNIV COLLEGE PARK DEPT OF WIND TUNNEL OPERATIONS
Personal Author(s) : Windsor, Richard I
PDF Url : AD0873253
Report Date : Mar 1970
Pagination or Media Count : 241
Abstract : A literature survey was conducted to determine the state of the art of measuring and predicting aerodynamic characteristics of oscillating airfoils. Aerodynamic forces on a two-dimensional NACA 0012 airfoil oscillating sinusoidally in pitch were measured by two techniques. The forces were obtained from pressure measurements and by means of strain gage balances. Pressure measurements were made on the airfoil oscillating in pitch about the quarter-chord point at various mean angles of attack. Strain gage balance readings were obtained for models with pitch axis located at 25, 37, and 50 percent chord points oscillating about various mean angles. Direct force measurements were employed in an effort to obtain drag data. Instantaneous pressure distributions are presented for representative oscillating conditions.
Descriptors : *AIRFOILS, *OSCILLATION, AERODYNAMIC CHARACTERISTICS, ANGLE OF ATTACK, DRAG, FORCE(MECHANICS), HELICOPTER ROTORS, PITCH(MOTION), PRESSURE, STATISTICAL DATA
Subject Categories : Helicopters
Distribution Statement : APPROVED FOR PUBLIC RELEASE