Accession Number : AD0738304

Title :   Visualization of Unsteady Flow over Oscillating Airfoils,

Corporate Author : ILLINOIS INST OF TECH CHICAGO DEPT OF MECHANICAL AND AEROSPACE ENGINEERING

Personal Author(s) : Ruiter,George H. ; Nagib,Hassan M. ; Fejer,Andrew A.

Report Date : SEP 1971

Pagination or Media Count : 39

Abstract : The study is concerned primarily with the complex nature of leading edge flow separation occurring on airfoils oscillating in a uniform flow field at low Reynolds Numbers. The flow field past an oscillating airfoil and a fixed airfoil with an oscillating flap were investigated using various visualization techniques in water. The role of mean flow velocity, instantaneous angle of attack, mean angle of attack and amplitude and frequency of oscillation as well as the location of the support point are examined. The results which were obtained over a range of parameters substantially beyond previous studies include new information regarding the effect of these parameters on the nature and onset of separation.

Descriptors :   (*LEADING EDGES, FLOW SEPARATION), (*ROTOR BLADES(ROTARY WINGS), LEADING EDGES), STALLING, VORTICES, OSCILLATION, FLOW VISUALIZATION, ANGLE OF ATTACK, VELOCITY

Subject Categories : Aerodynamics
      Aircraft
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE