Comparison of different models for non-equilibrium CO2 flows in a shock layer near a blunt body

Кустова, Е. В.; Нагнибеда, Е. А.; Shevelev, Yu. D.; Syzranova, N. G.

doi:10.1007/s00193-011-0324-0

Cited by 49 publications

(30 citation statements)

References 22 publications

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“…The free stream is supposed to be consisted of pure CO 2 , the body surface is assumed to be either non-catalytic or fully catalytic. The results are presented in [14,15] and show the behaviour of flow parameters in a shock layer and heat transfer to the vehicle surfaces.…”

Section: Resultsmentioning

confidence: 99%

“…In order to understand the influence of a kinetic model on macroscopic flow parameters and heat transfer to the body surface, we solved in [14,15] the system of governing equations not only in the three-temperature approximation but also the two-temperature and one-temperature approaches. In the first case, a single vibrational temperature for all three CO 2 modes T υ = T 12 = T 3 is introduced; and in the second model T 12 = T 3 = T .…”

Section: Resultsmentioning

confidence: 99%

“…The governing equations are derived in [15] from the kinetic equations for distribution functions and include the conservation equations of mass, momentum and total energy coupled to the equations of chemical kinetics and two relaxation equations for vibrational energies of coupled and asymmetric modes:…”

Section: Multi-temperature Models For Co 2 Mixturesmentioning

confidence: 99%

“…It is worth mentioning that the vibrational specific state-to-state mechanism for a carbon dioxide mixture has been developed in our previous work [11], and here it is applied for the specific test case. Existing multi-temperature 2D shock layer flow results [14,15], are used to define the boundary layer edge conditions for the state-to-state simulations performed in this study.…”

Section: Introductionmentioning

confidence: 99%

“…The model takes into account various mechanisms of CO 2 vibrational relaxation and gives the expressions for transport coefficients which may be implemented into the viscous flow solvers. In [14,15], the five-component reacting mixture CO 2 /CO/O 2 /C/O was studied and the accurate transport algorithms were implemented directly into CFD solver for simulation of a 2D flow in a viscous shock layer near spacecrafts entering the Mars atmosphere. The flows near space vehicles Mars Sample Return Orbiter (MSRO), Mars Express and blunt bodies of different shape for various free stream conditions in the cases of fully-catalytic and non-catalytic vehicle surfaces were studied on the basis of this model.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Vibrational-Chemical Kinetics in Mars Entry Problems

Kustova¹,

Нагнибеда²,

Armenise³

2014

TOPPJ

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The paper deals with kinetic theory methods modelling of reacting gas flows near spacecrafts entering the Mars atmosphere. For mixtures containing CO 2 molecules, the complete kinetic scheme including all vibrational energy transitions, dissociation, recombination and exchange chemical reactions is proposed. For the prediction of gas dynamic parameters and heat transfer to the surface of a spacecraft, a detailed approach taking into account state-to-state CO 2 vibrational and chemical kinetics as well as multi-temperature approaches based on quasi-stationary vibrational distributions are used. A more accurate but complicated and time consuming state-to-state model is applied for the numerical simulation of a one-dimensional flow in a boundary layer near the entering body surface. More simple quasistationary three-temperature, two-temperature and one-temperature approaches are used for the numerical study of a 2-D viscous shock layer under entry conditions. The vibrational distributions near the surface are far from the local vibrational and chemical equilibrium and a noticeable difference is found between the values of CO 2 vibrational-specific energies at the surface obtained by means of the state-to-state and quasi-stationary approaches. At the same time, for all considered approaches, the kinetic model for vibrational distributions and chemical reactions has a weak influence on the heat transfer to the non-catalytic vehicle surface.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Multi-temperature Models For Co 2 Mixturesmentioning

confidence: 99%