Numerical modeling of Earth reentry flow with surface ablation

Alba, Christopher R., Greendyke, Robert B., Lewis, Steven W., Morgan, Richard G. and McIntyre, Timothy J. (2016) Numerical modeling of Earth reentry flow with surface ablation. Journal of Spacecraft and Rockets, 53 1: 84-97. doi:10.2514/1.A33266


Author Alba, Christopher R.
Greendyke, Robert B.
Lewis, Steven W.
Morgan, Richard G.
McIntyre, Timothy J.
Title Numerical modeling of Earth reentry flow with surface ablation
Journal name Journal of Spacecraft and Rockets   Check publisher's open access policy
ISSN 0022-4650
1533-6794
Publication date 2016
Sub-type Article (original research)
DOI 10.2514/1.A33266
Open Access Status Not Open Access
Volume 53
Issue 1
Start page 84
End page 97
Total pages 14
Place of publication Reston, VA, United States
Publisher American Institute of Aeronautics and Astronautics
Collection year 2017
Language eng
Abstract Vehicles entering planetary atmospheres at high speed require an ablative heat shield to withstand the high thermal energy flux to the body. The interaction between the ablative products and the flowfield is not well characterized. In this study, numerical simulations were conducted to investigate the influence of carbon ablation on shock-layer radiation. Data collected from experiments performed in the X-2 expansion tunnel at the University of Queensland were used to compare to the simulations. The model was a short half-cylinder made of isomolded graphite and was tested in 8.6 km∕s Earth entry flow. The graphite model was heated within a temperature range of 1770–2410 K over the course of the experimental campaign. The radiation emitted from the CN violet bands was measured by ultraviolet spectrometry in a spectral range from 353 to 391 nm. The simulations used the Park as well as Zhluktov and Abe finite-rate surface kinetic models for determining the chemical state of the ablating boundary layer. The Park model consistently overpredicted the radiative heat fluxes, but better comparison was achieved when a modified nitridation rate was used. The Zhluktov and Abe predictions displayed good agreement with the measured radiative heat fluxes at 1770 K but remained well below the measured values at the higher wall temperatures. The lack of a nitridation mechanism in the Zhluktov and Abe model is suggested as the reason for these underpredictions.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
School of Mechanical & Mining Engineering Publications
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Created: Wed, 16 Mar 2016, 11:37:17 EST by Maata Moka on behalf of School of Mechanical and Mining Engineering