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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.

Comments

This conference paper is available from the publisher, AIAA, through subscription or purchase using the DOI link below.

Author note: Matthew Clarey was an AFIT PhD candidate at the time of this conference. (AFIT-ENY-DS-18-S-059, September 2018)

Source Publication

2018 AIAA Aerospace Sciences Meeting

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