Radiation transfer in air and air-Cu plasmas for two temperature profiles

Kloc, Petr; Aubrecht, V.; Bartlova, Milada; Coufal, Oldřich

doi:10.1088/0022-3727/48/5/055208

Cited by 18 publications

(14 citation statements)

References 33 publications

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“…On the other hand, the absorption of radiation in the cold regions at the edge of the arc is almost independent of the metal concentration when this concentration remains low (up to 10 %). Our results are similar to those of [14,19]. It should be noted that the results for silver are probably underestimated.…”

Section: P 1 Approximation and Mean Absorption Coefficientssupporting

confidence: 88%

“…Various methods have been used to calculate the radiation of thermal plasmas. We can mention among them the method of partial characteristics [13], the discrete ordinate (SN) method [14] and finally the P 1 method [15]. Each of these methods uses simplifying assumptions about the spectral dependence of equation 3or spatial dependence and often both.…”

Section: P 1 Approximation and Mean Absorption Coefficientsmentioning

confidence: 99%

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Influence of metal vapours on radiation characteristics of air arc plasmas

Bartlova¹,

Kloc²,

Aubrecht³

et al. 2020

PPT

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This paper deals with the evaluation of radiation properties of air arc plasma with various admixtures of Cu, Ag, and Fe, respectively. Under assumption of isothermal plasma cylinder, the net emission coefficients were calculated for various arc radii as a function of the plasma temperature up to 30000K. For plasma with prescribed temperature profile, the equation of radiation transfer was solved in the P1approximation, and the radiation flux and its divergence were calculated.

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Section: P 1 Approximation and Mean Absorption Coefficientssupporting

confidence: 88%

Section: P 1 Approximation and Mean Absorption Coefficientsmentioning

confidence: 99%

Influence of metal vapours on radiation characteristics of air arc plasmas

Bartlova¹,

Kloc²,

Aubrecht³

et al. 2020

PPT

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“…It is possible then to precompute all thermodynamic properties and store in the form of lookup tables as described in ( [5][6][7]). For simplicity, electrode erosion and ablation of wall material were neglected, making it possible to consider pure air arc discharge.…”

Section: Materials Propertiesmentioning

confidence: 99%

A Review of Progress Towards Simulation of Arc Quenching in Lightning Protection Devices Based on Multi Chamber Systems

Chusov¹,

Rodikov²,

Murmann

et al. 2017

PPT

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Abstract. Two distinct modes of follow current suppression were observed in multi-chamber systems (MCS) under lightning overvoltage: Zero Quenching (ZQ) and Impulse Quenching (IQ). Sufficiently lower erosion of electrodes and evaporation of discharge chamber walls makes the IQ more preferable as a mechanism of arc quenching. Since experimental search for best MCS design is both difficult and expensive numerical modeling is considered as a prospective method for geometry optimization. Several steps were made towards development of efficient arc model. This article highlights most important results of arc quenching simulation and current status of arc model development.

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“…The model used to calculate the spectral radiation transfer (referenced as exact in this paper) can be characterized as a one dimensional DOM model and was more thoroughly described in [10]. The calculation domain has a shape of an infinite plasma cylinder with 1 cm radius and an axisymmetrical temperature profile.…”

Section: First Stepmentioning

confidence: 99%

“…The number of spatial points was chosen as a reasonable compromise between the computational time and accuracy also considering that r Á F ex varies slowly along the radius for the considered test cases. The exact calculation method is described in [10]. This provides enough points for comparison in the third step while still keeping the computation time reasonably low.…”

Section: First Stepmentioning

confidence: 99%

On the Selection of Integration Intervals for the Calculation of Mean Absorption Coefficients

Kloc

Aubrecht

Bartlova

et al. 2015

Plasma Chem Plasma Process

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In radiation modeling of thermal plasmas non-grey models are applied where the radiative transport is described in several frequency bands (spectral intervals). Hereby mean absorption coefficients have to be calculated by a spectral integration procedure, providing a constant mean absorption coefficient for each band. Depending on the number of bands, one or more integration boundaries have to be selected in order to do the integration. In this paper we evaluate the influence of the selection of these integration boundaries on the mean absorption coefficient and the also radiation transfer by applying the mean absorption coefficients in a radiation transport model. Using a simplified twoband model we demonstrate that the selection of the integration boundary has a large impact on the total model accuracy. We show that in some cases selecting a band boundary right at the frequency where the continuum absorption shows a jump can introduce a significant error into the radiation calculation. The process of the integration interval selection thus demands a global optimization procedure to properly evaluate the boundaries of each frequency band.

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Radiation transfer in air and air-Cu plasmas for two temperature profiles

Cited by 18 publications

References 33 publications

Influence of metal vapours on radiation characteristics of air arc plasmas

Influence of metal vapours on radiation characteristics of air arc plasmas

A Review of Progress Towards Simulation of Arc Quenching in Lightning Protection Devices Based on Multi Chamber Systems

On the Selection of Integration Intervals for the Calculation of Mean Absorption Coefficients

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