Abstract :
Variation of the structure of one guided streamer moving along two counterpropagating helium jets is studied by means of numerical simulation. It is shown, in agreement with experimental results, that, due to variation of the gas composition along the streamer path, the radial intensity profile changes during streamer propagation. Its form, being initially, just after emerging from the first tube, an annular one, changes to a spherical one far from the tube, in the middle of the gap, and returns again to an annular one when approaching the second tube.
Keywords :
discharges (electric); helium; numerical analysis; plasma jets; plasma simulation; He; ambient air; annular tube; counterpropagating helium jets; gas composition variation; guided streamer structure; numerical simulation; radial intensity profile; single streamer simulation; spherical tube; streamer propagation; Atmospheric measurements; Atmospheric modeling; Discharges (electric); Electron tubes; Helium; Mathematical model; Plasmas; Plasma jet; streamer;
