Transition mechanism of negative DC corona modes in atmospheric air: from Trichel pulses to pulseless glow

Abstract

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A three-dimensional model of streamer discharges in unsteady airflow

“…Charged particles dynamics are modeled by drift-diffusion equations [18][19][20]. + n e ν i − S r e−p − S r n−p , (1.2) ∂n n ∂t = ∇ • (D n ∇n n ) + ∇ • (v air + μ n En n ) + n e ν a − S r n−p , (1.3) where n e , n p , and n n are the densities of electrons, positive ions and negative ions and E is the electric field vector.…”

Effect of humidity and air pressure on the discharge modes transition characteristics of negative DC corona

“…In [13], Kurimoto and Farish found that the gas temperature of negative pulseless glow in air is ∼500-900 K. The heat is transferred to the surrounding region by air convection. Chen et al [19] showed that gas heating plays a more important role on the transition process than the detachment of negative ions. In [27], the gas temperature of pulsed positive coronas in atmospheric air was measured.…”

“…At higher humidity, the vibrational-translational (V-T) collision rates of H 2 O-O 2 , H 2 O-N 2 and H 2 O-H 2 O are significantly enhanced, so the energy transfer between O 2 and N 2 to the translational energy is accelerated, resulting in an increase in gas temperature. When the gas temperature increases, the gas number density decreases and the reduced electric field (E/N) increases [19]. The electron impact ionisation increases significantly, and the drift velocity of charged particles is also increased, which can expedite the transition process.…”

“…The Peek formula is modified so that the calculated corona current is consistent with the experimental results. Chen et al [19] found that the Trichel pulses-glow transition voltage for a needle-cylinder DC corona discharge, was smaller than that calculated by the drift-diffusion model. After taking into consideration the gas dynamics, it was demonstrated that gas heating has a more important influence on the transition process than the detachment of negative ions.…”

A practical guide to modeling low-current quasi-stationary gas discharges: Eigenvalue, stationary, and time-dependent solvers

“…31 Thus, in the case of a pulsed corona, time-dependent solvers, while being an adequate tool for studies of spatiotemporal evolution of individual pulses (e.g., Refs. [31][32][33][34][35], cannot be used for the direct calculation of time-averaged characteristics of the discharge. The latter can be conveniently computed by means of stationary solvers in the framework of the integrated approach being used in this section.…”