Comparative analysis of reduced-order spectral models and grouping strategies for non-equilibrium radiation

Sahai, Amal; Johnston, Christopher O.; López, Bruno; Panesi, Marco

doi:10.1016/j.jqsrt.2019.106752

Cited by 9 publications

(2 citation statements)

References 37 publications

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“…2015; Munafo, Liu & Panesi 2015; Munafo, Mansour & Panesi 2017; Sahai et al. 2017, 2019, 2020; Sharma, Liu & Panesi 2020). The 0-D calculations of the air collisional–radiative model for typical re-entry conditions indicated that the distributions of chemical species exhibit large differences from the results obtained by the global air chemical models (Bultel et al.…”

Section: Introductionmentioning

confidence: 97%

“…Therefore, compared with the conventional thermochemical non-equilibrium models, the collisional-radiative model can more reasonably predict the energy relaxation processes, chemical non-equilibrium and excited energy levels non-equilibrium phenomena. At present, the collisional-radiative model is usually implemented in zero-dimensional (0-D) (Teulet, Sarrette & Gomes 2001;Bultel et al 2006;Capitelli et al 2007;Annaloro & Bultel 2014) and one-dimensional (1-D) models (Panesi et al 2009;Campoli et al 2020;Du et al 2022), but has not been used in multi-dimensional flow calculations so far due to its intensive computational cost, and some simplification methods, such as the multi-group maximum entropy method, were proposed for simplifying the CR model for future coupling to multi-dimensional computational fluid dynamics (CFD) simulation (Liu et al 2015;Munafo, Liu & Panesi 2015;Munafo, Mansour & Panesi 2017;Sahai et al 2017Sahai et al , 2019Sahai et al , 2020Sharma, Liu & Panesi 2020). The 0-D calculations of the air collisional-radiative model for typical re-entry conditions indicated that the distributions of chemical species exhibit large differences from the results obtained by the global air chemical models (Bultel et al 2006;Annaloro & Bultel 2014).…”

Section: Introductionmentioning

confidence: 99%

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Numerical study on the non-equilibrium characteristics of high-speed atmospheric re-entry flow and radiation of aircraft based on fully coupled model

Du,

Sun,

Tan

et al. 2023

J. Fluid Mech.

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The strong coupling interactions of non-equilibrium flow, microscopic particle collisions and radiative transitions within the shock layer of hypersonic atmospheric re-entry vehicles makes accurate prediction of the aerothermodynamics challenging. Therefore, in this study a self-consistent non-equilibrium flow, collisional–radiative reactions and radiative transfer fully coupled model are established to study the non-equilibrium characteristics of the flow field and radiation of vehicle atmospheric re-entry. The comparison of the present calculation results with flight data of FIRE II and previous results in the literature shows a reasonable agreement. The thermal, chemical and excited energy level non-equilibrium phenomena are obtained and analysed for the different FIRE II trajectory points, which form the critical basis for studying the heat transfer and radiation. The non-equilibrium distribution of excited energy levels significantly exists in the post-shock and near-wall regions due to the rapid vibrational dissociation and electronic under-excitation, as well as the wall catalytic reactions. The analysis of stagnation-point heating of FIRE II illustrates that the translational–rotational convection and the dissociation component diffusion play key roles in the aerodynamic heating of the wall region. The spectrally resolved radiative intensity in the entire flow field indicates that the vacuum ultraviolet radiation caused by the high-energy nitrogen atomic spectral lines makes the main contribution to the radiative transfer. Finally, it is found that the non-equilibrium flow–radiation coupling effect can exacerbate the excited energy level non-equilibrium, and further affect the gas radiative properties and radiative transfer. This fully coupled study provides an effective method for reasonable prediction of atmospheric re-entry flow and radiation fields.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Numerical study on the non-equilibrium characteristics of high-speed atmospheric re-entry flow and radiation of aircraft based on fully coupled model

Du,

Sun,

Tan

et al. 2023

J. Fluid Mech.

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The Finite-Element with Discontiguous-Support Method

Till

Adams

Morel

2021

Nuclear Science and Engineering

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Vibrational excitation cross sections for non-equilibrium nitric oxide-containing plasma

Laporta¹,

Vialetto²,

Guerra³

2022

Plasma Sources Sci. Technol.

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A full set of vibrationally-resolved cross sections for electron impact excitation of NO(X 2Π, v) molecules is calculated from ab initio molecular dynamics, in the framework of the Local-Complex-Potential approach. Electron-vibration energy exchanges in non-equilibrium thermodynamic conditions are studied from a state-to-state model accounting for all electron impact excitation and de-excitation processes of the nitric oxide vibration manifold, and it is shown that the calculated vibration relaxation times are in good agreement with the experimental data. The new vibrational excitation cross sections are used in a complete electron impact cross section set in order to obtain non-equilibrium electron energy distributions functions and to calculate electron transport parameters in NO. It is veriﬁed that the new cross sections bring a signiﬁcant improvement between simulations and experimental swarm data, providing an additional validation of the calculations, when used within the complete set of cross sections investigated in this work.

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Comparative analysis of reduced-order spectral models and grouping strategies for non-equilibrium radiation

Cited by 9 publications

References 37 publications

Numerical study on the non-equilibrium characteristics of high-speed atmospheric re-entry flow and radiation of aircraft based on fully coupled model

Numerical study on the non-equilibrium characteristics of high-speed atmospheric re-entry flow and radiation of aircraft based on fully coupled model

The Finite-Element with Discontiguous-Support Method

Vibrational excitation cross sections for non-equilibrium nitric oxide-containing plasma

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