Abstract:An inherent aerodynamic limitation of high-advance-ratio high-speed helicopters is reverse flow on the retreating blades, which can be a source of several unsteady effects, like vortex formation, that reduce rotor performance. The current study is the first detailed comparison of a rotor with a conventional, sharp trailing-edge NACA 0012 airfoil section with one equipped with a blunt-edge elliptical airfoil section. The aim was to detect and quantify vortex formation in reverse flow using planar particle image… Show more
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