Discharge characteristics of argon plasma plume from solid to hollow

doi:10.3969/j.issn.1000-1565.2021.06.004

Abstract

Abstract: The argon plasma jet excited by a biased sinusoidal voltage are investigated in an atmospheric pressure environment. The results show that as the biased voltage increases from negative to positive, the resultant plume transits from solid to hollow. The discharge characteristics of solid plume and hollow plume are studied by electrical and optical means, and it is found that there is only one discharge pulse per voltage cycle for these two plumes. Through fast photography, the plump guided bullet is found to propagate in the solid plume, which involves a negative streamer mechanism. The hollow plume involves a positive streamer mechanism, which manifests as a thin guided streamer starting from the end of the driven electrode, and then gradually evolving into branching streamers propagating in the flow periphery. By spectroscopy, the electron temperature of the different positions from the nozzle are studied. Based on the interaction of Penning ionization and residual negative ions, the production mechanism of these two plumes is explained.

Key words: plasma plume, biased sinusoidal voltage, streamer, optical emission spectrum

CLC Number:

O461

YIN Zengqian, WU Lijiao. Discharge characteristics of argon plasma plume from solid to hollow[J]. Journal of Hebei University(Natural Science Edition), 2021, 41(6): 654-660.

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