Abstract
The noise generation by moderate-Reynolds number airfoils is still a topic of major interest because of the wide area of its applications. However, the underlying mechanism is not totally clear. The present paper is dealing with an exhaustive experimental characterization addressing aerodynamic and acoustic quantities. The symmetric NACA-0012 airfoil and the slightly cambered SD7003 airfoil at moderate incidence (angles of attack varied from −5 to +7) are tested in the free-jet anechoic wind tunnel of Ecole Centrale de Lyon. Measurements of wall pressure, far-field acoustic pressure and velocity fluctuations using the hot-wire anemometry are described. In addition advanced post-processing techniques are applied, such as the time-frequency analysis and the bicoherence in order to highlight some non-linear features and/or intermittency. Three regimes of noise emission are identified depending on the configuration and flow velocity. The results complement the database started in previous investigations. They are used for comparison with numerical simulations presented in the second part of the paper.
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