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A study on heat flux predictions for re-entry flight analysis

Park, Seong-Hyeon and Gülhan, Ali and Neeb, Dominik and Plyushchev, Gennady and Leyland, Penelope (2021) A study on heat flux predictions for re-entry flight analysis. Acta Astronautica, 187, pp. 271-280. Elsevier. doi: 10.1016/j.actaastro.2021.06.025. ISSN 0094-5765.

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0094576521003222?dgcid=rss_sd_all

Abstract

The analysis of the risk from re-entry objects has become an important topic. Concerning the uncertainties and different flow regimes, the object-oriented tools have been developed and used for various re-entry mission scenarios because of the simplified computation process and low calculation burden, which allow a probabilistic analysis. In this study, the heat flux correlations that are used in the object-oriented tools are investigated and compared to better understand the heat flux predictions with respect to re-entry survivability. Often these tools calculate the continuum stagnation-point heat flux using the correlation formulae of Lees and Fay-Riddell, which usually assume local thermo-chemical equilibrium with a fully-catalytic wall condition in the shock layer. Based on this observation, heat flux measurements were conducted in a hypersonic wind tunnel, and validated with the theory of Fay-Riddell considering the equivalent velocity gradient. For the comparison, in total, 11 different heat flux correlations were examined. It is shown that, based on the formula of Fay-Riddell, the differences in the final integrated heat flux were less than 16% which led to a large discrepancy in the survivability estimations for the cases of small spheres made of aluminum. This shows the importance of considering the heat flux correlation as well as the velocity gradient effect for such re-entry analysis.

Item URL in elib:https://elib.dlr.de/144421/
Document Type:Article
Title:A study on heat flux predictions for re-entry flight analysis
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Park, Seong-HyeonUNSPECIFIEDUNSPECIFIED
Gülhan, AliAli.Guelhan (at) dlr.deUNSPECIFIED
Neeb, DominikDominik.Neeb (at) dlr.deUNSPECIFIED
Plyushchev, GennadyUNSPECIFIEDUNSPECIFIED
Leyland, PenelopeUNSPECIFIEDUNSPECIFIED
Date:2021
Journal or Publication Title:Acta Astronautica
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:187
DOI :10.1016/j.actaastro.2021.06.025
Page Range:pp. 271-280
Editors:
EditorsEmailEditor's ORCID iD
Jeng-Shing Chern, RockUNSPECIFIEDUNSPECIFIED
Publisher:Elsevier
Series Name:Elsevier Acta Astronautica
ISSN:0094-5765
Status:Published
Keywords:Re-entry Heat flux correlations Hypersonic Survivability
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Reusable Space Systems and Propulsion Technology
Location: Köln-Porz
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Supersonoc and Hypersonic Technology
Deposited By: Jäger, Monika
Deposited On:12 Nov 2021 13:35
Last Modified:16 Nov 2021 12:32

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