Model of acoustic sources related to negative point-to-plane discharges in ambiant air

ISSN： 1610-1928

Source： Acta Acustica united with Acustica, Vol.83, Iss.2, 1997-03, pp. : 359-366

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Abstract

The acoustic sources from negative point to plane discharges in an ionized gas are studied both theoretically and experimentally. Inside the gap, the two main mechanisms responsible for the transfers between ionized and neutral particles (heat and momentum transfer) are determined to be at the origin of the acoustic generation. The effects associated to these two mechanisms are shown to have the same order of magnitude, the heat transfer giving rise to a monopole radiation at lower frequencies, and the momentum transfer being more or less dipolar and predominant in the higher frequency range. In order to validate the theoretical models proposed, two transducers and an experimental set-up were developed. The experimental results seem to validate these basic results, although the calculus for the pressure field still needs some improvements.