Three-Temperature Models for Thermochemical Non-Equilibrium in Compression and Expansion
Document Type
Conference Proceeding
Publication Date
1-8-2018
Abstract
Hypersonic fluid dynamic simulations commonly model thermochemical nonequilibrium processes with the twotemperature model, which consists of a translational-rotational and vibrational-electronic-electron temperature. However, constricting the free-electron energy, by grouping it with the vibrational, the two-temperature model does not model certain nonequilibrium phenomena, which decreases the fidelity of the solution. A three-temperature model, consisting of a translational-rotational, vibrational, and electron-electronic temperature, increases the degrees of freedom of the simulation, permitting the electron temperature to be independent, and thus captures more nonequilibrium physics than the two-temperature model. Such a three-temperature model was implemented within a computational-fluid-dynamics framework for the simulation of hypersonic flows, with particular attention paid to wake flowfields. Validation was completed against the RAM C-II flight test data, and an assessment of the threetemperature model's performance within the wake was completed. Finally, a study characterizing the wake behind a generic, slender cone geometry was completed, in which the nonequilibrium processes were shown to extend a significant distance into the wake.
DOI
Source Publication
2018 AIAA Aerospace Sciences Meeting
Recommended Citation
Clarey, M. P., & Greendyke, R. B. (2018, January). Three-Temperature Models for Thermochemical Non-Equilibrium in Compression and Expansion. 2018 AIAA Aerospace Sciences Meeting. https://doi.org/10.2514/6.2018-0743
Comments
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Author note: Matthew Clarey was an AFIT PhD candidate at the time of this conference. (AFIT-ENY-DS-18-S-059, September 2018)