Abstract
The unsteady stall characteristics of 15% thickness elliptic airfoils oscillating in pitch at a Reynolds number of 3×105 in two-dimensional flow conditions are investigated experimentally. Unsteady surface pressure data are obtained for a wide range of mean angles of attack and oscillation frequencies, and the flow fields and the aerodynamic forces and moments acting on the airfoils are analysed based on the pressure data. Chordwise movement of suction pressure waves on the upper surface subsequent to the leading edge separations is observed, and this feature corresponds well with the calculated flow fields with stall vortex shedding phenomena which are presented in the 1st and the 2nd report of present research.
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