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Study on Air Film Approach in Reentry Blackout Mitigation

Miyashita, Takashi and Takasawa, Hideto and Takahashi, Yusuke and Steffens, Lars and Gülhan, Ali (2024) Study on Air Film Approach in Reentry Blackout Mitigation. AIAA Journal. American Institute of Aeronautics and Astronautics (AIAA). ISSN 0001-1452.

Full text not available from this repository.

Abstract

Communication blackouts are among the most severe problems in the atmospheric reentry phase. Flight data are lost because the plasma gas generated by aerodynamic heating interrupts telecommunications. Therefore, mitigation methods are necessary to improve the accuracy of the landing-site prediction. In this study, we demonstrated the effectiveness of a air film, which is a thin insulating coolant layer on the surface, as a novel mitigation method. Here, we show that a gas injection system can reduce the reentry blackout. The coupled approach with computational fluid dynamics and a frequency-dependent finite-difference time-domain method resolved the plasma flow properties and electromagnetic propagation around the test model in the arc-heated wind tunnel L3K in DLR (German Aerospace Center). The numerical results indicated that the injected nitrogen gas formed an insulating air film layer on the surface. The thin layer advected backward, maintaining a low temperature without ionization, and covered the object in the wake region. The electromagnetic waves propagated and reached a distant area because the electron density was low inside. This means that the air film layer acted as a propagation window for the telecommunication waves. Thus, communication blackouts can be avoided because electromagnetic waves can be transmitted through the air-film layer. It can be concluded that the air film effect, developed as a thermal protection technique, is a novel mitigation scheme for reentry blackouts.

Item URL in elib:https://elib.dlr.de/200881/
Document Type:Article
Title:Study on Air Film Approach in Reentry Blackout Mitigation
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Miyashita, TakashiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Takasawa, HidetoHokkaido UniversityUNSPECIFIEDUNSPECIFIED
Takahashi, YusukeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Steffens, LarsUNSPECIFIEDhttps://orcid.org/0000-0002-2561-0687UNSPECIFIED
Gülhan, AliUNSPECIFIEDhttps://orcid.org/0000-0003-4905-5881UNSPECIFIED
Date:2024
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0001-1452
Status:Accepted
Keywords:Communication black-out, Mitigation, Experiments, Air film approach
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 > Supersonic and Hypersonic Technology
Deposited By: Gülhan, Dr.-Ing. Ali
Deposited On:14 Dec 2023 09:36
Last Modified:14 Dec 2023 09:36

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