The diameter of a stem, a common origin point for streamers where the transition from the streamer to the leader takes place, has a significant effect on the simulation of streamer-to-leader transition. To measure the diameter of the stem, a schlieren system was established with the temporal and spatial resolutions of 5 μs and 70 μm, respectively. Experiments were conducted under positive lightning and switching impulses; the applied voltage, discharge current, and schlieren images were recorded synchronously. A method was proposed to measure the diameter of the stem based on the schlieren images, with which the stem diameter as a function of time was obtained. Moreover, the initial diameters of the stem under different conditions were obtained through the linear fitting. At last, a relation between the initial cross-sectional area of the stem and the discharge current was given within a certain range.
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Research Article| June 03 2019
On the stem diameter under positive impulses in long air gaps
Pei Xiao ;
Xiangen Zhao ;
Pei Xiao, Junjia He, Xiangen Zhao, Yongchao Yang, Wahab Ali shah; On the stem diameter under positive impulses in long air gaps. Phys. Plasmas 1 June 2019; 26 (6): 063501. https://doi.org/10.1063/1.5089684
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