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Article Dans Une Revue Journal of Applied Physics Année : 2020

Analysis of energy exchanges during the interaction between pulsed lightning arcs and metallic plates

Résumé

Lightning electrical arcs lead to high temperature and high pressure air plasmas where radiation is a dominant energy transfer mechanism. The aim of this work is to evaluate the energy exchanges during the arc-electrode interaction for metallic plates impacted by pulsed lightning arcs that can reach 100 kA, with peak time of around 13 µs and full width at half maximum (FWHM) of 40 µs. Rear surface temperatures are measured with infrared camera, and an experimental parametric study on current amplitude, material, plate thickness and arc polarity is performed, with a total of eighteen studied configurations. An inverse method using the heat conduction equation and taking into account Joule heating is applied to estimate the incoming heat flux at the plate surface. To compare with experimental results and to analyze the contribution of radiative transfer, calculations of the incoming radiative flux from the arc column on the plate are performed. Experimental time-and space-resolved temperature and pressure distributions of the arc column are used for these computations, which are performed using a line by line calculation based on accurate plasma spectroscopic data, in association with a ray tracing method. An energy budget analysis is proposed and the influence of the different mechanisms is discussed. A transferred energy higher than 300 J is observed for the 100 kA current waveform. The comparisons show that radiative flux from the arc channel can play an important role in the energy balance at the plate surface.
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Dates et versions

hal-03074574 , version 1 (16-12-2020)

Identifiants

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Rafael Sousa Martins, Philippe Rivière, Clément Zaepffel, Françoise Passilly, Anouar Soufiani. Analysis of energy exchanges during the interaction between pulsed lightning arcs and metallic plates. Journal of Applied Physics, 2020, 128 (22), pp.223301. ⟨10.1063/5.0025616⟩. ⟨hal-03074574⟩
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