Non-Equilibrium Supersonic CO[sub 2] Flows with Real Gas Effects near a Blunt Body

Kustova, Elena; Нагнибеда, Е. А.; Shevelev, Yu. D.; Syzranova, N. G.

doi:10.1063/1.3076591

Cited by 12 publications

(17 citation statements)

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“…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%

“…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%

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vibrational-Chemical Kinetics in Mars Entry Problems

Kustova¹,

Нагнибеда²,

Armenise³

2014

TOPPJ

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“…So, the gas thermal energy may be comparable with the energy associated with a whole range of gas chemical processes such as: molecular vibrational excitation; dissociation of atmospheric molecules into their atomic forms; formation of other chemical species through recombination reactions; and ionization of both molecular and atomic species [17]. Therefore, the gas mixture has to be considered in thermal and chemical nonequilibrium.…”

Section: Reentrymentioning

confidence: 99%

Nonequilibrium computational flowfield analysis for the design of mars manned entry vehicles

Viviani

Pezzella

2013

Progress in Flight Physics

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This paper deals with the aerodynamic exploration analysis of innovative unusual vehicle concepts, suitable for a manned Mars entry, aiming to support design studies of planetary entry systems. In this framework, two lifting body (LB) con¦gurations have been analyzed so far. Several fully three-dimensional (3D) computational §uid dynamics (CFD) analyses, both for a perfect gas model and for a nonequilibrium reacting gas mixture model, have been performed. The §ow¦eld environment past the exploration vehicle for an assigned Mars entry scenario has been addressed. To this end, a wide range of §ow conditions, including di¨erent angles of attack (AoA), various Mach numbers, and Reynolds numbers, have been investigated. Results reported in the paper are useful for providing numerical data for further understanding the §uid dynamics processes, as those of high enthalpy §ow and vehicle shape e¨ects, involved in the design analysis of LB vehicles for the exploration of Mars.

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“…They refer to entry conditions compatible with a vehicle entering the Mars atmosphere both from a hyperbolic orbit (HO), e.g., direct planetary entry, and an elliptic orbit (EO) e.g., planetary entry after aerobraking (Gupta et al, 1996). (Gupta et al, 1996) ) (Kustova et al, 2009). For the reacting gas computations, the Martian atmosphere has been considered as a mixture of 95.7% carbon-dioxide, 1.6% Argon and 2.7% nitrogen.…”

Section: Freestream Conditionsmentioning

confidence: 99%