High temperature Mars atmosphere. Part I: transport cross sections

Laricchiuta, Annarita; Bruno, D.; Capitelli, M.; Catalfamo, C.; Celiberto, R.; Colonna, G.; Diomede, P.; Giordano, D.; Gorse, C.; Longo, S.; Pagano, D.; Pirani, Fernando

doi:10.1140/epjd/e2009-00192-7

Cited by 73 publications

(52 citation statements)

References 57 publications

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“…Chemistry-vibration coupling was accounted for by Treanor [25], comprising 16 species and 34 reactions for CO 2 -N 2 flows, which presented tuned kinetic rates to match CO fourth-positive and CN Violet band radiation measured at NASA's Electric Arc Shock Tube facility. The Gupta-Yos mixing rule [26,27] was applied, with the relevant collision integrals [28,29], to calculate the viscosity and thermal conductivity of the mixture. Ramshaw and Chang's [30] self-consistent effective binary diffusion approximation to the Stefan-Maxwell equations was used to calculate mass diffusion.…”

Section: A Flowfield Modelingmentioning

confidence: 99%

Venus Entry Flow over a Decomposing Aeroshell in X2 Expansion Tube

Banerji¹,

Leyland²,

Fahy³

et al. 2018

Journal of Thermophysics and Heat Transfer

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The effects of phenolic decomposition on shock-layer radiation were investigated experimentally in X2 expansion tube for a Venus entry flow. A carbon-phenolic composite aeroshell was subjected to a flow with a flight equivalent velocity of 9.35 km ⋅ s −1 . Emission spectroscopy was used to measure boundary-layer radiation in parts of the ultraviolet (380-480 nm) and visible (620-700 nm) spectrum, and it was compared to control measurements taken with a cold steel model. With the composite model in place, the calibrated spectral radiance measured was seen to increase for the O (645.598 nm) atomic line and the N 2 (391.22 nm) band head, but it decreased for the C 2 Swan band (420-480 nm). The recorded data were then compared to numerical spectra produced by two-dimensional axisymmetric computational fluid dynamic simulations coupled to a radiation solver. Both of the applied chemistry models overpredicted CN violet Δν 0 band radiation, which demonstrated strong self-absorption at these conditions. Better comparisons were achieved for the C 2 Swan band radiation. At visible wavelengths, peak intensities were underestimated by the numerical simulations. Several possible reasons were hypothesized for these discrepancies.

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Section: A Flowfield Modelingmentioning

confidence: 99%

Venus Entry Flow over a Decomposing Aeroshell in X2 Expansion Tube

Banerji¹,

Leyland²,

Fahy³

et al. 2018

Journal of Thermophysics and Heat Transfer

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“…The collision cross sections used in the third-order approximation were obtained by Ghorui et al [31] for collision pairs of electron and charged species, and by Laricchiuta et al [32] for electron and neutral species. For chemical reactions in high-temperature air, the gas is assumed to consist of 11 chemical…”

Section: Governing Equationsmentioning

confidence: 99%

Plasma flow modeling for Huels-type arc heater with turbulent diffusion

et al. 2017

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In this study, we developed an analytical model for the flow field in the Huels-type arc-heated wind tunnel (L2K) of the German Aerospace Center. This flow-field model can be used to accurately reproduce the discharge behavior in the heating section and expansion in the nozzle section of L2K. It includes the radiation transport and turbulent flow, as well as thermochemical nonequilibrium models, which are tightly coupled with electric field calculations. In addition, we considered the turbulent diffusion model for the mass conservation of the species and performed numerical simulations for several cases with and without the turbulent diffusion model. Computations were used to obtain the general characteristics of an arc-heated flow containing an arc discharge and supersonic expansion. We verified that radiation and turbulence play important roles in the transfer of heat from the high-temperature core flow to the outer cold gas in the heating section of L2K. In addition, we performed parametric studies that involved varying the degree of turbulent diffusion. The results showed that turbulent diffusion has a large influence on the formation of the arc discharge in the heating section and on the enthalpy distribution at the nozzle exit.

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“…[13,[22][23][24][25][26][27][28][29][30][31] was used for the calculations. 5.6 × 10 1 a The coefficients δ rot eh were calculated without account of the polarization corrections to the rotational excitation cross sections of molecules.…”

Section: System Of Scalar Transport Equations For the Electronsmentioning

confidence: 99%