Modeling of helium plasma jets emerged into ambient air: Influence of applied voltage, jet radius, and helium flow velocity on plasma jet characteristics

Simulation of guided positive streamers propagating along helium jets emerged into ambient air is performed, in the framework of a standard two-dimensional streamer model, for various values of parameters (applied voltage, helium flow velocity, and jet radius) governing the streamer dynamics and structure. Obtained dependencies of the streamer velocity, radius, and propagation length on the governing parameters are compared with available results of observations.