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| Experiment and Simulation on the Discharge Modality of Atmospheric Pressure Plasma Jets in Argon Based on Coaxial Straight Tube and Inverted Tapered Tube |
| Ren Fuqiang1, Ji Shengchang1, Zhu Lingyu1, Hao Zhiyuan2, Lu weifeng1, Li Xining1 |
1. State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Xi’an 710049 China;
2. DC Technology Consultancy Centre of State Power Economic Research Institute Beijing 102209 China |
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Abstract In this paper, the Ar atmospheric pressure plasma jet (APPJ) generated with coaxial straight tube and inverted tapered tube was experimentally investigated at first, and then the Ar mole fraction distribution inside both tubes was simulated numerically with two-dimensional axis-symmetrical models. The continuity equation, Navier-Stokes equations, k-ε turbulence equation and species mass transportation equation were coupled and solved. The results showed that, in laminar flow, the discharge developed along the inner wall of straight tube unsteadily, but along the central axis of tapered tube stably. Compared with straight tube, the tapered tube could improve Ar mole fraction distribution in laminar flow. A thin layer, composed of air and argon with low fraction, hindered the discharge along the inner surface, which maintained the stability of the discharge. While the argon was in turbulent flow, due to radial diffusion, the Ar mole fraction distributions inside both tubes were identical, and thus the discharge differed little.
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Received: 31 August 2016
Published: 02 May 2017
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2017, Vol. 32 
