Propagation of atmospheric pressure helium plasma jet into ambient air at laminar gas flow

5th International Congress on Energy Fluxes and Radiation Effects 2016

Pinchuk, M.^1,2 ; Stepanova, O.^2 ; Kurakina, N.^1 ; Spodobin, V.^1,2

Laboratory of Gas-Dynamic Systems, Institute for Electrophysics and Electric Power, Russian Academy of Sciences, St.-Petersburg

191186, Russia^1

Faculty of Physics, Saint Petersburg State University, St.-Petersburg

199034, Russia^2

关键词: Atmospheric pressure plasma jets;    Coaxial electrodes;    Dielectric barrier discharges;    Dynamic property;    Electrophysical parameters;    Experimental and numerical studies;    Helium plasmas;    Laminar regime;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/830/1/012060/pdf
DOI  :  10.1088/1742-6596/830/1/012060

来源: IOP

【 摘 要 】

The formation of an atmospheric pressure plasma jet (APPJ) in a gas flow passing through the discharge gap depends on both gas-dynamic properties and electrophysical parameters of the plasma jet generator. The paper presents the results of experimental and numerical study of the propagation of the APPJ in a laminar flow of helium. A dielectric-barrier discharge (DBD) generated inside a quartz tube equipped with a coaxial electrode system, which provided gas passing through it, served as a plasma source. The transition of the laminar regime of gas flow into turbulent one was controlled by the photography of a formed plasma jet. The corresponding gas outlet velocity and Reynolds numbers were revealed experimentally and were used to simulate gas dynamics with OpenFOAM software. The data of the numerical simulation suggest that the length of plasma jet at the unvarying electrophysical parameters of DBD strongly depends on the mole fraction of ambient air in a helium flow, which is established along the direction of gas flow.