For about 10 years now, at the Aerodynamics Department of the Office National d'Etudes et de Recherches Ae´rospatiales (ONERA), experimental and theoretical studies have been performed in order to improve the capability to perform accurate measurements as well as to predict the
characteristics of the flow around a helicopter blade. The different phases of the experimental work, as well as analytical studies concerning blade tip planform effects, are presented and the main results obtained are analyzed. From a purely aerodynamic point of view, these results demonstrate
that it is possible for high speed rotor blades to define new blade tip shapes that should minimize some of the problems due to transonic flows such as the increase of power required, of vibration level, or of impulsive noise generated by the rotor.
Office National d'Etudes et de Recherches Ae´rospatiales, Chatillon, France
Publication date: January 1, 1989
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