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Plasma Sci. Technol. ›› 2018, Vol. 20 ›› Issue (5): 054010.doi: 10.1088/2058-6272/aaaad9

• THE 8TH INTERNATIONAL CONFERENCE ON APPLIED ELECTROSTATICS • Previous Articles     Next Articles

Numerical study of the influence of dielectric tube on propagation of atmospheric pressure plasma jet based on coplanar dielectric barrier discharge

Haixin HU (胡海欣), Feng HE (何锋), Ping ZHU (朱平) and Jiting OUYANG (欧阳吉庭)   

  

  1. School of Physics, Beijing Institute of Technology, Beijing 100081, People’s Republic of China
  • Received:2017-10-23 Published:2018-01-26

Abstract:

A 2D fluid model was employed to simulate the influence of dielectric on the propagation of atmospheric pressure helium plasma jet based on coplanar dielectric barrier discharge (DBD). The spatio-temporal distributions of electron density, ionization rate, electrical field, spatial charge and the spatial structure were obtained for different dielectric tubes that limit the helium flow. The results show that the change of the relative permittivity of the dielectric tube where the plasma jet travels inside has no influence on the formation of DBD itself, but has great impact on the jet propagation. The velocity of the plasma jet changes drastically when the jet passes from a tube of higher permittivity to one of lower permittivity, resulting in an increase in jet length, ionization rate and electric field, as well as a change in the distribution of space charges and discharge states. The radius of the dielectric tube has a great influence on the ring-shaped or solid bullet structure. These results can well explain the behavior of the plasma jet from the dielectric tube into the ambient air and the hollow bullet in experiments.

Key words: plasma jet, jet velocity, propagation, hollow structure