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Surface catalysis effects on mitigation of radio frequency blackout in orbital reentry

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Title: Surface catalysis effects on mitigation of radio frequency blackout in orbital reentry
Authors: Takahashi, Yusuke Browse this author →KAKEN DB
Enoki, Naoya Browse this author
Takasawa, Hideto Browse this author
Oshima, Nobuyuki Browse this author →KAKEN DB
Keywords: atmospheric reentry
mitigation of radio frequency blackout
surface catalysis effects
electromagnetic waves in plasma
Issue Date: 3-Jun-2020
Publisher: IOP Publishing
Journal Title: Journal of Physics D : Applied Physics
Volume: 53
Issue: 23
Start Page: 235203
Publisher DOI: 10.1088/1361-6463/ab79e0
Abstract: Radio frequency (RF) blackout during atmospheric reentry leads to the cutoff of communication with ground stations and/or data-relay satellites. This causes significant problems during reentry, and thus, mitigation methods have been in high demand. In this study, we numerically demonstrate a novel method for mitigating the RF blackout using surface catalysis effects. Plasma flow behavior and electromagnetic wave propagation around a reentry vehicle were investigated in detail. The approach couples computational fluid dynamics and a frequency-dependent finite-difference time-domain method. The computations were performed with a massive parallelization technique using a large computer. The computed results were compared for cases imposing low and full catalysis conditions on a surface boundary. The investigation revealed that the surface catalysis effects reduce the RF blackout. Atomic species, dissociated across a shock wave formed in front of the vehicle, were recombined on the vehicle surface through surface catalysis. These molecules, flowing into a wake region at the vehicle's rear, caused recombinations of electrons, originally generated in the shock layer. Therefore, a decrease in electrons was observed in the wake region and a wake path, which allows the propagation of electromagnetic waves, was formed. This complicated behavior of the molecules and electrons, induced by the surface catalysis, resulted in mitigation of the RF blackout.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高橋 裕介

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