Numerical modeling of the streamer-cathode interaction in a short positive point-plane corona gap

“…Note that, in the case of single-streamer propagation, calculations also give an increase in streamer velocity. However, it occurs close to the cathode, at distances less than 0.2 cm (not shown in figure 2), for which, for a correct description of the streamer dynamics, streamer-cathode interaction must be taken into account [4].…”

Section: Results Of the Calculationmentioning

confidence: 99%

“…The expression for additional electric field can be incorporated into any model developed for calculation of single-streamer propagation. The description of streamers in non-uniform electric fields is usually based on quasi-2D models [2][3][4][5][6]. In these models, distributions of plasma parameters in the streamer channel in the radial direction (normal to the direction of streamer propagation) are taken to be the known functions and are usually stepwise.…”

Section: The Modelmentioning

confidence: 99%

On streamer interaction in a pulsed positive corona discharge

Naidis

1996

J. Phys. D: Appl. Phys.

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An approximate method is presented to take account of interaction of positive streamers simultaneously propagating between a wire and a plate. The method is based on a quasi-2D positive streamer model modified by inclusion in the expression for electric field of an additional term describing the field of charges of all streamer channels in the gap. All streamers are assumed to be identical and to move parallel to each other to the plate from points equidistantly distributed along the wire surface. The model is used for calculation of streamer dynamics in atmospheric air for conditions under which simultaneously propagating streamers have been observed. It is shown that taking account of streamer interaction improves the agreement of the calculated dependence of streamer velocity on its length with the experimental one.

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“…In this model, to simplify calculations, the production of photons I is assumed to be equal to the ionization production rate S i [Odrobina and Cernak , 1991;Georghiou et al, 2001;Brandeburg et al, 2009] and then the only coefficient to be determined to model the photoemission source term is γ photoem in Eq. (5).…”

Section: Discharge Modelmentioning

confidence: 99%

“…In this model, to simplify calculations, the production of photons I is assumed to be equal to the ionization production rate S i (Odrobina and Cernak 1992, Georghiou et al 2001, Brandeburg et al 2009 and then the only coefficient to be determined to model the photoemission source term is γ photoem in equation ( 5). In fact, this coefficient is poorly known in air and then in many studies of dielectric barrier discharges in air, photoemission is often neglected (e.g.…”

Section: Discharge Modelmentioning

confidence: 99%

Simulation of the discharge propagation in a capillary tube in air at atmospheric pressure

Jánský¹,

Tholin²,

Bonaventura³

et al. 2010

J. Phys. D: Appl. Phys.

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Abstract. This paper presents simulations of an air plasma discharge at atmospheric pressure initiated by a needle anode set inside a dielectric capillary tube. We have studied the influence of the tube inner radius and its relative permittivity ε r on the discharge structure and dynamics. As a reference, we have used a relative permittivity ε r = 1 to study only the influence of the cylindrical constraint of the tube on the discharge. For a tube radius of 100 µm and ε r = 1, we have shown that the discharge fills the tube during its propagation and is rather homogeneous behind the discharge front. When the radius of the tube is in the range 300 to 600 µm, the discharge structure is tubular with peak values of electric field and electron density close to the dielectric surface. When the radius of the tube is larger than 700 µm, the tube has no influence on the discharge which propagates axially. For a tube radius of 100 µm, when ε r increases from 1 to 10, the discharge structure becomes tubular. We have noted that the velocity of propagation of the discharge in the tube increases when the front is more homogeneous and then, the discharge velocity increases with the decrease of the tube radius and ε r . Then, we have compared the relative influence of the value of tube radius and ε r on the discharge characteristics. Our simulations indicate that the geometrical constraint of the cylindrical tube has more influence than the value of ε r on the discharge structure and dynamics. Finally, we have studied the influence of photoemission processes on the discharge structure by varying the photoemission coefficient. As expected, we have shown that photoemission, as it increases the number of secondary electrons close to the dielectric surface, promotes the tubular structure of the discharge.

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Numerical modeling of the streamer-cathode interaction in a short positive point-plane corona gap

Cited by 14 publications

References 16 publications

Automated Fluid Model Generation and Numerical Analysis of Dielectric Barrier Discharges Using Comsol

Automated Fluid Model Generation and Numerical Analysis of Dielectric Barrier Discharges Using Comsol

On streamer interaction in a pulsed positive corona discharge

Simulation of the discharge propagation in a capillary tube in air at atmospheric pressure

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