Numerical analysis on the effect of angle of attack on evaluating radio-frequency blackout in atmospheric reentry

Jung, Minseok; Kihara, Hisashi; Abe, Kenichi; Takahashi, Yusuke

doi:10.3938/jkps.68.1295

Cited by 14 publications

(6 citation statements)

References 21 publications

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“…Recently, Jung et al performed three-dimensional simulations for two reentry experiments, which are the Orbital Reentry Experiment (OREX) by Japan and the Atmospheric Reentry Demonstrator (ARD) by ESA [11]. The simulation results showed good agreement with the experimental data.…”

Section: Introductionmentioning

confidence: 49%

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Studies on the Effect of Angle of Attack on the Transmission of Terahertz Waves in Reentry Plasma Sheaths

Yuan¹,

Yao²,

Shen³

et al. 2017

PIER M

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Abstract-The communication 'blackout' in the reentry stage of a space mission is a serious threat to the reentry vehicle. The terahertz (THz) technology is supposed to be a potential solution to the 'blackout' problem in the recent decade. In the present paper, the relation between the THz waves' transmission in the reentry plasma sheath and the angle of attack (AOA) of the vehicle is investigated. A three-dimensional numerical model is introduced in order to obtain the plasma parameters in the reentry plasma sheaths. The computation results show that both the electron density and the electron collision frequency vary with the AOA. As results, the transmission rates for the THz waves vary with the AOA as well. According to the analysis, microwave communication system is very likely to suffer from the 'blackout' in the reentry stage. The THz scheme is an effective solution. The fluctuation of AOA may weaken the signal strength received by the onboard antenna. On the other hand, keeping the AOA in an appropriate range is helpful for strengthening the received THz signals. Also, the AOA for the best THz communication quality is obtained according to the analysis.

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Section: Introductionmentioning

confidence: 49%

“…The reentry speed is 6550 m/s, which is identical to the RAMC-II experiment at the same altitude. Since the AOA of the ARD experiment is 20 • [11], the range of the AOA concerned in the present study is from 0 • to 30 • .…”

Section: The Hypersonic Fluid Modelmentioning

confidence: 99%

Studies on the Effect of Angle of Attack on the Transmission of Terahertz Waves in Reentry Plasma Sheaths

Yuan¹,

Yao²,

Shen³

et al. 2017

PIER M

View full text Add to dashboard Cite

show abstract

“…The ExoMars Schiaparelli was a ballistic entry with a maximum angle of attack of ∼ 6 • (Tolker-Nielsen 2017). Regarding the effect of this boundary on the ionized flow field in the wake, Jung et al (2016) performed numerical simulations of the ARD by using an axisymmetric and a 3-D model. Jung et al stated that although there were no differences in the shock layer between the axisymmetric and 3-D model, the formation of the electron density was greatly changed in the wake when a non-zero angle of attack was considered.…”

Section: Boundary Conditions For Cfd Solvermentioning

confidence: 99%

Blackout analysis of Mars entry missions

et al. 2020

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“…Huang et al investigated the Sabot asymmetric discard after the projectile being launched from the muzzle at various AOA . Jung et al performed a numerical analysis on the effect of angle of attack on evaluating radio‐frequency blackout in atmospheric reentry from the perspective of analyzing the electron density . In addition, the USim software, which is developed from the Tech‐X Corporation for general fluid plasma modeling on unstructured grids, is employed to model the flow field around hypersonic vehicles in this paper .…”

Section: Introductionmentioning

confidence: 99%

Impact of angle of attack on plasma flow and electromagnetic wave propagation around hypersonic vehicles

Ouyang

Liu

Zhang

2020

Micro & Optical Tech Letters

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The flow field around the RAMC-II vehicle at differenrt angles of attack (AOA) was numerically solved using a computational fluid dynamics technique with a threedimensional model. Electron density, pressure, temperature, and collision frequency, which is given great importance in this paper. The maximal electron density, total pressure, and temperature at the same position decreases with the angle of attack on the leeward side and increases with the angle of attack on the windward side. The collision frequency is almost unaffected by AOA on the leeward side, but increases significantly with AOA on the windward side. Based on the realistic plasma sheaths obtained by hypersonic fluid model, a multilayer transmission model was used to study the electromagnetic (EM) wave propagation in plasma sheath at different AOA. The attenuation value of EM wave on the leeward (windward) side decreases (increases) with the AOA. So the influence of the AOA on the EM wave transmission must be considered in the communication of vehicle reentry. In addition, the EM wave attenuation on the leeward at the same angle of attack is always smaller than the windward side, especially at a large AOA. Therefore, the leeward side can be considered as one end of the communication to improve the communication quality. The conclusions of this paper have both theoretical and practical significance to better understand the communication"blackout" problem for the reentry of hypersonic vehicles. K E Y W O R D S angle of attack, electromagnetic wave attenuation, electron density, flow field, plasma sheath 1 | INTRODUCTIONDuring the hypersonic reentry stage of the RAMC-II mission, the surface temperature of the vehicle rises sharply due to the formation of shock waves in front of the vehicle. High temperatures cause more intense chemical reactions, such as ionization and the dissociation of gases, and results in a weakly ionized plasma layer that forms around the vehicle, such plasma layer is the so-called "plasma sheath". 1 The plasma sheath that covers hypersonic vehicles causes the communication "blackout". To avoid this communication "blackout", many studies have been conducted, such as simulation of plasma flow, 2 techniques to reduce the electron plasma density, 3-5 and the mechanism of utilizing the propagation of electromagnetic waves. [6][7][8] In the actual reentry process, the vehicle has a certain angle of attack. The influence of different angles of attack (AOA) on the flow field around hypersonic vehicles has attracted significant attention. Lin et al studied the structure of the near wake flow of a hypersonic reentry vehicle and the resulting base pressure and heat transfer. 9 Torrez et al developed a control-oriented scramjet engine model that was exercised to predict the sensitivity of the thrust with variations in the Mach number and angle of attack. 10 Salmasi et al studied the influence of the existence of a plasma actuator on the passing flow at poststall AOA through numerical simulation and experiments. 11 Huang et al investigated ...

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Numerical analysis on the effect of angle of attack on evaluating radio-frequency blackout in atmospheric reentry

Cited by 14 publications

References 21 publications

Studies on the Effect of Angle of Attack on the Transmission of Terahertz Waves in Reentry Plasma Sheaths

Studies on the Effect of Angle of Attack on the Transmission of Terahertz Waves in Reentry Plasma Sheaths

Blackout analysis of Mars entry missions

Impact of angle of attack on plasma flow and electromagnetic wave propagation around hypersonic vehicles

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