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NI Gengsong (倪耿松), QIAN Muyang (钱沐杨), YANG Congying (杨丛影), LIU Sanqiu (刘三秋), WANG Dezhen (王德真). N2 Mole Fraction Dependence of Plasma Bullet Propagation in Premixed He/N2 Plasma Needle Discharge at Atmospheric Pressure[J]. Plasma Science and Technology, 2016, 18(7): 751-758. DOI: 10.1088/1009-0630/18/7/09
Citation: NI Gengsong (倪耿松), QIAN Muyang (钱沐杨), YANG Congying (杨丛影), LIU Sanqiu (刘三秋), WANG Dezhen (王德真). N2 Mole Fraction Dependence of Plasma Bullet Propagation in Premixed He/N2 Plasma Needle Discharge at Atmospheric Pressure[J]. Plasma Science and Technology, 2016, 18(7): 751-758. DOI: 10.1088/1009-0630/18/7/09
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N2 Mole Fraction Dependence of Plasma Bullet Propagation in Premixed He/N2 Plasma Needle Discharge at Atmospheric Pressure

  • 1Department of Physics, Nanchang University, Nanchang 330031, China 2School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116023, China

Funds: supported by National Natural Science Foundation of China (No. 11465013), the Natural Science Foundation of Jiangxi Province, China (No. 20151BAB212012), and in part by the International Science and Technology Cooperation Program of China (No. 2015DFA61800)
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  • Received Date: August 25, 2015
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  • In this work, a computational modeling study on the mechanism of the acceleration behavior of a plasma bullet in needle-plane configuration is presented. Above all, in our model, two sub-models of time-dependent plasma dynamics and laminar flow are connected using a one-way coupled method, and both the working gas and the surrounding gas around the plasma jet are assumed to be the same, which are premixed He/N2 gas. The mole fractions of the N2 (NMF) ingredient are set to be 0.01%, 0.1% and 1% in three cases, respectively. It is found that in each case, the plasma bullet accelerates with time to a peak velocity after it exits the nozzle and then decreases until getting to the treated surface, and that the velocity of the plasma bullet increases at each time moment with the peak value changing from 0.72×106 m/s to 0.80×106 m/s but then drops more sharply when the NMF varies from 0.01% to 1%. Besides, the electron impact ionizations of helium neutrals and nitrogen molecules are found to have key influences on the propagation of a plasma bullet instead of the penning ionization.
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