Unsteady Aerodynamics of an Aerofoil at High Angle of Incidence Performing Various Linear Oscillations in a Uniform Stream

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Abstract
During forward flight, the flow past the blade of a helicopter is complex owing to three‐dimensional flow effects and unsteadiness. One can try to model such a flowfield by unsteady 2‐D experiments. Most of the experimental and theoretical studies undertaken on this topic have tackled the problem by investigating aerofoils oscillating in pitch in steady flow, while little attention has been paid to effect of simultaneous oscillating velocity and oscillating incidence on stall. The aim of this paper is to present a new approach to the experimental study of a stalled rotor blade by investigating the unsteady aerodynamics of an aerofoil performing linear oscillations in a uniform stream. In particular, the case of oscillation with respect to the undisturbed flow involving simultaneously out‐of‐phase incidence and velocity variations is studied.

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