Radiative transfer in gases under thermal and chemical nonequilibrium conditions: Application to earth atmospheric re-entry

Lamet, Jean-Michel; Babou, Yacine; Rivière, Philippe; Perrin, Marie‐Yvonne; Soufiani, Anouar

doi:10.1016/j.jqsrt.2007.08.026

Cited by 36 publications

(10 citation statements)

References 4 publications

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“…Different approaches are investigated: collisional radiative model, 124 a line by line treatment, 125 mean values used in a statistical narrow-band model for optically thick molecular systems, 126 or the separation of the radiative phenomena linked to the continua and to the lines for thick plasmas.…”

Section: Discussionmentioning

confidence: 99%

Basic knowledge on radiative and transport properties to begin in thermal plasmas modelling

Cressault

2015

AIP Advances

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This paper has for objectives to present the radiative and the transport properties for people beginning in thermal plasmas. The first section will briefly recall the equations defined in numerical models applied to thermal plasmas; the second section will particularly deal with the estimation of radiative losses; the third part will quickly present the thermodynamics properties; and the last part will concern the transport coefficients (thermal conductivity, viscosity and electrical conductivity of the gas or mixtures of gases). We shall conclude the paper with a discussion about the validity of these results the lack of data for some specific applications, and some perspectives concerning these properties for non-equilibrium thermal plasmas. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. [http://dx

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Section: Discussionmentioning

confidence: 99%

Basic knowledge on radiative and transport properties to begin in thermal plasmas modelling

Cressault

2015

AIP Advances

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“…For diatomic molecules in air plasmas, the relaxation of electronic energy levels is quicker than vibrational levels and dissociation processes [23]. In order to make use of Eq.…”

Section: Diatomic Molecular Emissionmentioning

confidence: 99%

A simplified method for calculating spectral emission of nonequilibrium air plasmas in hypersonic shock-layers

Cheng

Jiang

2021

Adv. Aerodyn.

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A simplified method for calculating the spectral emission of nonequilibrium air plasmas is developed. In order to obtain the nonequilibrium energy level populations, the nonequilibrium coefficients are introduced into the Saha-Boltzmann equation. These nonequilibrium coefficients are calculated by using several significant radiative processes. An approach to the determination of nonequilibrium electronic energy level populations of diatomic molecules is also presented. Based on the method, spectral emission of atoms and molecules in a typical air plasma cell is investigated. The results reveal that there is a significant difference between the nonequilibrium and equilibrium emission. We apply the method to the nonequilibrium AVCO R-156 experiment. Good agreement with the NEQAIR code and the measured data is shown, indicating that the method is reasonable and has good accuracy.

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“…For diatomic molecules in air plasmas, the relaxation of electronic energy levels is quicker than vibrational levels and dissociation processes [23]. Based on this, we assumed that the molecules do not experience dissociation during the investigated time step.…”

Section: Diatomic Molecular Emissionmentioning

confidence: 99%

A Simplified Method for Calculating Spectral Emission of Nonequilibrium Air Plasmas in Hypersonic Shock-Layers

Gao

Jiang

2020

Preprint

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A simplified method for calculating the spectral emission of nonequilibrium air plasmas is developed. In order to obtain the nonequilibrium energy level populations, the nonequilibrium coefficients are introduced into the Saha-Boltzmann equation. These nonequilibrium coefficients are calculated by using several significant radiative processes. An approach to the determination of nonequilibrium electronic energy level populations of diatomic molecules is also presented. Based on the method, spectral emission of atoms and molecules in a typical air plasma cell is investigated. The results reveal that there is a significant difference between the nonequilibrium and equilibrium emission. We apply the method to the nonequilibrium AVCO R-156 experiment. Good agreement with the measured data is shown, indicating that the method is reasonable and has good accuracy.

show abstract

Radiative transfer in gases under thermal and chemical nonequilibrium conditions: Application to earth atmospheric re-entry

Cited by 36 publications

References 4 publications

Basic knowledge on radiative and transport properties to begin in thermal plasmas modelling

Basic knowledge on radiative and transport properties to begin in thermal plasmas modelling

A simplified method for calculating spectral emission of nonequilibrium air plasmas in hypersonic shock-layers

A Simplified Method for Calculating Spectral Emission of Nonequilibrium Air Plasmas in Hypersonic Shock-Layers

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