Etude du vent ionique produit par décharge couronne à pression atmosphérique pour le contrôle d'écoulement aérodynamique

Abstract : The studydeals with ionic wind produced by a corona discharge created by two electrodes connected to a high voltage power supply, in the aim to understand the phenomenaof the ionic wind and the parameters that control its velocity in air at amopsheric pressure. A parametric study is realized on the gas distance, the diameter and the material of the electrodes, the voltage, its polarity, the current and the gas nature. In parallel, a 2D steady-state numerical model of the discharge and of the ionic wind is developped, solving simultaneously the Poisson equation, the continuity equations for electrons, positive ions, negative ions and the Naviers-Stokes equations. The system is closed with expressions modelling the kinetics chemistry of the discharge and the transport of charges. The simulations have been done with FLUENT and complementar modules.The measurements show that the velocity of the ionic wind depends directly of the square root of the current. The geometrical parameters modify the current-voltage characterics. The material has no influence while the gas nature modifies the evolution of the velocity vs the current. Theses results are also fund with simulations which show that the secondary electron emission is neglectable in the studied configuration and that the ion mobility is important. The comparison between the measurements in differents gases helps to estimate the predominant ions in the ionic wind phenomenon. Simulations are in good agreement with experiments.
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  • HAL Id : tel-01071389, version 1

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Philippe Bérard. Etude du vent ionique produit par décharge couronne à pression atmosphérique pour le contrôle d'écoulement aérodynamique. Sciences de l'ingénieur [physics]. Ecole Centrale Paris, 2008. Français. ⟨NNT : 2008ECAP1085⟩. ⟨tel-01071389⟩

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