Numerical simulation of a CO2, CO, O2, O, C mixture: Validation through comparisons with results obtained in a ground-based facility and thermochemical effects

Kosareva, A.; Shoev, Georgy

doi:10.1016/j.actaastro.2019.01.029

Cited by 16 publications

(4 citation statements)

References 39 publications

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“…During the last decade, many studies of high temperature non-equilibrium CO 2 flows have been carried out using several approaches of various complexity: multi-temperature [47,[339][340][341][342][343], STS [46,[273][274][275][276] and reduced order coarse-graining techniques [344][345][346]. Different effects are discussed such as the influence of the flow conditions, thermo-chemical model, models for transport properties and radiation.…”

Section: Vibrational Kinetics In Hypersonic Entry Problems 71 General Considerationsmentioning

confidence: 99%

Advances in non-equilibrium $$\hbox {CO}_2$$ plasma kinetics: a theoretical and experimental review

et al. 2021

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Numerous applications have required the study of CO2 plasmas since the 1960s, from CO2 lasers to spacecraft heat shields. However, in recent years, intense research activities on the subject have restarted because of environmental problems associated with CO2 emissions. The present review provides a synthesis of the current state of knowledge on the physical chemistry of cold CO2 plasmas. In particular, the different modeling approaches implemented to address specific aspects of CO2 plasmas are presented. Throughout the paper, the importance of conducting joint experimental, theoretical and modeling studies to elucidate the complex couplings at play in CO2 plasmas is emphasized. Therefore, the experimental data that are likely to bring relevant constraints to the different modeling approaches are first reviewed. Second, the calculation of some key elementary processes obtained with semi-empirical, classical and quantum methods is presented. In order to describe the electron kinetics, the latest coherent sets of cross section satisfying the constraints of "electron swarm" analyses are introduced, and the need for self-consistent calculations for determining accurate electron energy distribution function (EEDF) is evidenced. The main findings of the latest zero-dimensional (0D) global models about the complex chemistry of CO2 and its dissociation products in different plasma discharges are then given, and full state-to-state (STS) models of only the vibrational-dissociation kinetics developed for studies of spacecraft shields are described. Finally, two important points for all applications using CO2 containing plasma are discussed: the role of surfaces in contact with the plasma, and the need for 2D/3D models to capture the main features of complex reactor geometries including effects induced by fluid dynamics on the plasma properties. In addition to bringing together the latest advances in the description of CO2 non-equilibrium plasmas, the results presented here also highlight the fundamental data that are still missing and the possible routes that still need to be investigated.

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Section: Vibrational Kinetics In Hypersonic Entry Problems 71 General Considerationsmentioning

confidence: 99%

Advances in non-equilibrium $$\hbox {CO}_2$$ plasma kinetics: a theoretical and experimental review

et al. 2021

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“…The most detailed description of the flows is provided by the state-to-state models (each vibrational state of a molecule on each electronic state is treated as a distinct entity). , In practice, such models are too complicated for simulation of three-dimensional flows. Because of that, multitemperature models are being developed, and such models need vibrational partition functions. − In ref a carbon monoxide molecule is studied in the range 5000–30 000 K, which uses both vibrational and rotational partition functions. In ref the highest temperature considered is 50 000 K, which is also the highest temperature considered in the present study.…”

Section: Introductionmentioning

confidence: 99%

Vibrational Partition Function for the Multitemperature Theories of High-Temperature Flows of Gases and Plasmas

Buchowiecki

2020

J. Phys. Chem. A

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The vibrational partition function is calculated using the classical method of integration over the whole phase space. The calculations were done for the ground electronic state of a carbon monoxide molecule. The main focus is on temperature in the range 5000–20 000 K, which is common in hypersonic flows of gases and plasmas. The method presented here, because of the exclusion of the noninteracting part of canonical partition function according to the ideas of T.L. Hill, is applicable at temperatures of tens of thousands of Kelvins, where the standard expression for the vibrational partition function fails. At lower temperatures (here 1000–6000 K), the correct quantum results can be obtained with the help of Wigner–Kirkwood expansion. The influence of vibrations on the rotational partition function by bond-length elongation is examined, and the results are compared with the exact ro-vibrational partition function.

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“…For some flow configurations, taking into account the effects of thermochemical non-equilibrium either has no effect or leads to small differences in the results obtained with equilibrium and non-equilibrium models [35]. A comparison of various models for describing the vibrational kinetics and chemical reactions in gas mixtures, as well as estimates of the effects of the initial vibrational nonequilibrium in a spatially homogeneous mixture and the influence of the vibrational excitation of gas molecules in free flow on the flow quantities behind the shock wave front are given in [36,37]. Such results show the importance of evaluating the various effects of vibrational and chemical non-equilibrium on flow parameters [11,38].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Relaxation Processes in Hypersonic Flows with One-Temperature Non-Equilibrium Model

Karpenko,

Tolstoguzov,

Volkov

2023

Fluids

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Steady-state one-dimensional flows of five-component air behind a normal shock wave are considered with a one-temperature model. A mathematical model is formulated to describe the relaxation of a five-component air mixture with a one-temperature non-equilibrium approximation. A numerical study of non-equilibrium flows of a reacting five-component air mixture behind shock waves at different heights and velocities of free flow is performed. The contribution of different types of reactions to the overall relaxation of the mixture is discussed, and the distributions of macro-parameters of the flow behind the shock wave front are calculated. The lengths of the relaxation zones behind the shock wave front are compared at different initial conditions. Calculations are performed for the standard model of atmosphere.

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Numerical simulation of a CO2, CO, O2, O, C mixture: Validation through comparisons with results obtained in a ground-based facility and thermochemical effects

Cited by 16 publications

References 39 publications

Advances in non-equilibrium $$\hbox {CO}_2$$ plasma kinetics: a theoretical and experimental review

Advances in non-equilibrium $$\hbox {CO}_2$$ plasma kinetics: a theoretical and experimental review

Vibrational Partition Function for the Multitemperature Theories of High-Temperature Flows of Gases and Plasmas

Simulation of Relaxation Processes in Hypersonic Flows with One-Temperature Non-Equilibrium Model

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