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Title: The effect of working gas impurities on plasma jets

Air intrusion reduced the purity of working gas inside the tube for plasma jet, and thereby, affected the discharge dynamics. In this paper, the effect of using working gas with different purity level (helium purity 99.99999%, 99.99%, 99.9%, and 99%) on photoionization and the chemical reactivity of plasma jet were studied using a 2 dimensional plasma jet model. Photoionization of air species acted as a source of pre-ionization in front of the ionization region, which facilitated the transition from localized discharge to streamers inside the tube. The density of reactive species inside the tube was found to increase with the concentration of working gas impurities. For the highest purity helium (99.99999%), despite a low photoionization rate and the distance between the photoionization region and ionization region inside the tube, by increasing the applied voltage and decreasing the distance between the electrode and nozzle, plasma jets were formed.
Authors:
;  [1] ;  [2] ;  [1] ;  [2] ;  [2]
  1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, WuHan, HuBei 430074 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22408374
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AIR INFILTRATION; DISTANCE; DYNAMICS; ELECTRIC DISCHARGES; ELECTRIC POTENTIAL; ELECTRODES; HELIUM; NOZZLES; PHOTOIONIZATION; PLASMA IMPURITIES; PLASMA JETS; REACTIVITY; TWO-DIMENSIONAL CALCULATIONS; WORKING FLUIDS