Narrow-band model for nonequilibrium air plasma radiation

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

doi:10.1016/j.jqsrt.2009.07.010

Cited by 32 publications

(12 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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

show abstract

Section: Discussionmentioning

confidence: 99%

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

Cressault

2015

AIP Advances

View full text Add to dashboard Cite

show abstract

“…Lamet et al 3,24 have proposed different strategies to evaluate η k σ (s ′ )τ k σ (s ′ , s) ∆σ , depending on the type of contribution k. To begin, the contributions are split into three groups, (i) opticallly thick molecular systems, (ii) optically thin molecular systems and continua, and (iii) atomic lines. The following splitting of the mean intensity is then introduced.…”

Section: The Hybrid Statistical Narrow Band Modelmentioning

confidence: 99%

“…Recently, Lamet et al 3 have shown that a high level of accuracy in the computed radiative flux can be achieved with a significant CPU savings by using a hybrid statistical narrow band model (HSNB) for uncoupled, nonablating flow fields typical to Earth reentry. The HSNB model reduces the spectral dimensionality by several orders of magnitude, allowing timely radiative flux calculations when coupled to a CFD solver via a Monte Carlo technique.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, a one-dimensional stagnation line code is coupled to the HSNB model of Lamet et al 3 and a steady-state ablation boundary condition to study the aforementioned effects of coupled radiation and ablation on typical high speed atmospheric entry conditions. In Section II, the dimensionally-reduced Navier-Stokes equations are introduced for a two-temperature, multicomponent, reacting flow, coupled to radiative heating and photochemical source terms.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Coupled Flow, Radiation, and Ablation Simulations of Atmospheric Entry Vehicles using the Hybrid Statistical Narrow Band Model

Scoggins

Soucasse

Rivière

et al. 2015

45th AIAA Thermophysics Conference

Self Cite

View full text Add to dashboard Cite

A model for coupled flow, radiation, and ablation calculations along the stagnation lines of atmospheric entry vehicles is developed to study the effects these coupled phenomena have on each other as well as the predicted quantities of interest to vehicle designers. The flow model is based on the two-temperature, multicomponent, reacting Navier-Stokes equations coupled to radiative heat and photochemistry source terms and reduced to onedimension using the dimensionally reduced Navier-Stokes approximation. The radiative source terms are computed using the hybrid statistical narrow band model developed at the EM2C laboratory at Ecole Centrale Paris. This model has previously been shown to accurately produce radiative properties at significantly reduced computational cost when compared to line-by-line calculations for uncoupled flows without ablation. In this work, the hybrid statistical narrow band model is coupled to the one-dimensional stagnation line flow solver with ablation. Ablation is treated through a simple steady-state ablation boundary condition with finite-rate heterogenous reactions capable of simulating ablation products blowing into the boundary layer. The model is first used to simulate the effect of carbonaceous species in a typical boundary layer environment. In particular, it is shown that a boundary layer contaminated with a relatively small amount of ablation and pyrolysis products can have significantly lower transmissivities than a boundary layer with pure air. Finally, the peak heating point for the Apollo 4 command module is analyzed using each of the four possible coupling strategies: flow, flow and ablation, flow and radiation, and fully coupled. It is shown that for this case, radiation coupling is the dominant phenomena due to a relatively small carbon yield in the boundary layer. In addition, comparison of cumulative intensities with the radiometer measurement made during the flight shows excellent agreement and confirms the assumption that the radiometer cavity has little effect on the measured intensity due to the low amount of carbon present in the cavity.

show abstract

“…), and escape factors are used to model the effects of the radiative processes on the population of the excited states. Needless to say the results are very much dependent on the assumption made when selecting the value of these and they strongly depend on the case under investigation (as suggested in [4]). In this work we propose a fully consistent treatment of the radiation processes where the influence of the radiation processes on the population of the excited states is correctly modeled as well as the cooling effects.…”

Section: Introductionmentioning

confidence: 99%

Non-equilibrium ionization phenomena behind shock waves

Panesi

Huo

2011

42nd AIAA Thermophysics Conference

View full text Add to dashboard Cite

Articles you may be interested inOn core compressibility of sandwich composite panels subjected to intense underwater shock loads J. Appl. Phys. 115, 024905 (2014) Abstract. An accurate investigation of the behavior of electronically excited states of atoms and molecules in the post shock relaxation zone of a trajectory point of the FIRE II flight experiment is carried out by means of a one-dimensional flow solver coupled to a collisional-radiative model. In the rapidly ionizing regime behind a strong shock wave, the high lying bound electronic states of atoms are depleted. This leads the electronic energy level populations of atoms to depart from Boltzmann distributions which strongly affects the non-equilibrium ionization process as well as the radiative signature. The importance of correct modeling of the interaction of radiation and matter is discussed showing a strong influence on the physico-chemical properties of the gas. The paper clearly puts forward the shortcomings of the simplified approach often used in literature which strongly relies on the escape factors to characterize the optical thickness of the gas.

show abstract

Narrow-band model for nonequilibrium air plasma radiation

Cited by 32 publications

References 22 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

Coupled Flow, Radiation, and Ablation Simulations of Atmospheric Entry Vehicles using the Hybrid Statistical Narrow Band Model

Non-equilibrium ionization phenomena behind shock waves

Contact Info

Product

Resources

About