Dsmc simulation of ablating microstructures at flight relevant conditions

Sahadeo Ramjatan, Michael Kroells, Thomas E. Schwartzentruber

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The oxidation of carbon-based ablative thermal protection systems is affected by the diffusion of gas from the boundary layer into the mesostructure and the reactivity of the gas with the microstructure (i.e. carbon fibers). To capture both of these effects, a DSMC approach is used and coupled to the ablating FiberGen code. FiberGen allows for movement of the triangles that make up the microstructure to account for gas surface reactions that remove carbon. A Thiele number analysis is performed based on the Stardust reentry trajectory to examine the diffusion of oxygen into the mesostructure at different trajectory points. In order to closely simulate the physics of a hypersonic boundary layer, a procedure for accurately imposing a CFD boundary layer onto a DSMC domain is presented. Subsequently, realistic boundary layer profiles from two Stardust reentry trajectory points are imposed over a mesostructure with and without ablation. This work provides insight on how in-depth oxidation occurs at flight relevant conditions.

Original languageEnglish (US)
Title of host publicationAIAA Scitech 2021 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
Pages1-25
Number of pages25
ISBN (Print)9781624106095
DOIs
StatePublished - 2021
EventAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021 - Virtual, Online
Duration: Jan 11 2021Jan 15 2021

Publication series

NameAIAA Scitech 2021 Forum

Conference

ConferenceAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021
CityVirtual, Online
Period1/11/211/15/21

Bibliographical note

Funding Information:
The authors acknowledge funding from NASA grant 80NSSC18K0261 and the work of M. Kroells is supported by a NASA NSTRF award under grant 80NSSC19K1129.

Publisher Copyright:
© 2021, American Institute of Aeronautics and Astronautics Inc, AIAA. All Rights Reserved.

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