A lightning strike to aircraft is associated with several types of phenomena and durations. The slow phenomena are mainly due to the continuing current stage of the lightning current, and are highly influenced by the displacement of the aircraft. More especially, the aerodynamic flow around the fuselage deforms the lightning channel and produces reattachments of the arc root at other locations. This type of lightning arc is called swept stroke. In this paper, we present an electric arc modelling that allows to simulate this phenomena, taking into account the chaotic behaviour of long electric arc, the jet of plasma produces at the attachment point and the flow profile close to the fuselage. The fuselage is assumed to be a planar unpainted panel with a displacement velocity of 100m/s, and the physical duration of the simulation is 25ms. During this time, more then 50 reattachments are observed in an expansion radius of about 3 cm around the mean axis of the arc. The simulated dwelling time is few milliseconds. The arc root structure is compared with an arc root of a simulation of a laboratory arc.
Simulation of a swept stroke discharge during lightning strike to aircraft with athree-dimensional electric arc model
2010
4 Seiten, 7 Bilder, 8 Quellen
Conference paper
English
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