A Novel Engineering Methodology for Decoupled Aerothermal Analysis of Hypersonic Atmospheric Entry

Justin M. Cooper, Alexandre Martin

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Analysis of TPS response to atmospheric entry is generally performed in a decoupled manner where some terms in the surface balance equations are ignored. In such an ap- proach, surface uxes are calculated using a computational uid dynamics solution of the hypersonics ow ffeld. These are non-dimensionalized for use by a material response code, where correction terms (such as blowing and hot-wall corrections) are applied to account for the missing physics, and surface ablation is estimated with further simplifying assump- tions. A new method is presented here which directly includes blowing and ablation physics, thus removing the need for correction models and simpliffed ablation assumptions. This approach includes the diffusion processes of ablative species in the boundary layer and in- cludes non-equilibrium surface chemistry when appropriate. A comparison is made between the heritage methodology, using a notional trajectory designed to allow molecular disso- ciation and vibrational energy contribution, while not reaching ionizing conditions. The new methodology predicts surface temperatures with the same qualitative trend, with the largest disagreements in areas of the trajectory where non-equilibrium effects are expected to occur. The solid ablation ux and subsequent recession behavior is constantly lower for the new method, but this discrepancy in surface thermochemistry can be decreased by adopting kinetic models with more aggressive oxidation mechanisms. Interestingly, it is found that a large difference in computed recession does not necessarily equate to the largest difference in heat shield sizing.

Original languageEnglish
Title of host publicationAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2021
DOIs
StatePublished - 2021
EventAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2021 - Virtual, Online
Duration: Aug 2 2021Aug 6 2021

Publication series

NameAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2021

Conference

ConferenceAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2021
CityVirtual, Online
Period8/2/218/6/21

Bibliographical note

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

ASJC Scopus subject areas

  • Aerospace Engineering
  • Energy Engineering and Power Technology
  • Nuclear Energy and Engineering

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