Survey of CO2 Radiation Experimental Data in Relation with Planetary Entry

Reynier, Ph.

doi:10.3390/galaxies9010015

Cited by 8 publications

(2 citation statements)

References 41 publications

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“…In 2008, a shock-tube campaign was carried out in the Moscow Institute of Physics and Technology (MIPT) under a contract from the European Space Agency (ESA). ,− The objective of the study was to validate the existing CFD tools employed in the design of the EXOMARS mission. Among the deployed diagnostics, a mercury lamp was used to measure the absorbance of the flow in the hot CO 2 (B → X) UV band around 253.7 nm.…”

Section: Resultsmentioning

confidence: 99%

Heavy Particle Impact Vibrational Excitation and Dissociation Processes in CO₂

2021

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A heavy particle impact vibrational excitation and dissociation model for CO2 is presented. This state-to-state model is based on the forced harmonic oscillator (FHO) theory, which is more accurate than current state-of-the-art kinetic models of CO2 based on first-order perturbation theory. The first excited triplet state 3B2 of CO2, including its vibrational structure, is considered in our model, and a more consistent approach to CO2 dissociation is also proposed. The model is benchmarked against a few academic zero-dimensional (0D) cases and compared to decomposition time measurements in a shock tube. Our model is shown to have reasonable predictive capabilities, and the CO2 + O ↔ CO + O2 reaction is found to have a key influence on the dissociation dynamics of CO2 shocked flows, warranting further theoretical studies. We conclude this study with a discussion on the theoretical improvements that are still required for a more consistent analysis of the vibrational/dissociation dynamics of CO2.

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Section: Resultsmentioning

confidence: 99%

Heavy Particle Impact Vibrational Excitation and Dissociation Processes in CO₂

2021

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“…Although only the radiation transitions of the vibrational mode are involved in the coupling of gas and radiation field in this work, a full consideration of all possible radiation transitions can be achieved straightforwardly in the framework of our general kinetic models. Meanwhile, an accurate prediction of the radiative environment requires a detailed understanding and reliable data of the radiation transitions at the molecular level, which can be acquired from the mathematical models (Zalogin et al 2001; Babou et al 2009), as well as experimental measurements in relevant conditions (Reynier 2021). In future work these realistic parameters will be incorporated into our general kinetic models to study the high-temperature rarefied (non-equilibrium) gas flow with strong radiation.…”

Section: Discussionmentioning

confidence: 99%

Kinetic modelling of rarefied gas flows with radiation

Zeng

Huang

et al. 2023

J. Fluid Mech.

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Two kinetic models are proposed for high-temperature rarefied (or non-equilibrium) gas flows with internal degrees of freedom and radiation. One of the models uses the Boltzmann collision operator to model the translational motion of gas molecules, which has the ability to capture the influence of intermolecular potentials, while the other adopts the relaxation time approximations, which has higher computational efficiency. In our kinetic model equations, not only the transport coefficients such as the shear/bulk viscosity and thermal conductivity but also their underlying relaxation processes are recovered. The non-equilibrium dynamics of gas flow and radiation are tightly coupled, where the transport properties of gas molecules and photons are correlatively dependent. The proposed kinetic models are validated by the direct simulation Monte Carlo method in several non-radiative rarefied gas flows (e.g. the normal shock wave, Fourier flow, Couette flow and the creep flow driven by the Maxwell demon), and the experimental data of planar heat transfer and normal shock waves in nitrogen. Then, the rarefied gas flows with strong radiation are studied based on the kinetic models, not only in the above one-dimensional gas flows, but also in the two-dimensional radiative hypersonic flow passing a cylinder. The characteristics of heat transfer in the tightly coupled fields of gas and radiation are systematically investigated, particularly the influence of the non-equilibrium photon transport and their interactions with gas molecules are revealed. It is found that the radiation makes a profound contribution to the total heat transfer in radiative hypersonic flow at an intermediate photon Knudsen number.

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