Journal ArticleDOI
Analyses of Electromagnetic Properties of a Hypersonic Object With Plasma Sheath
TLDR
In this article, the authors presented a rigorous numerical approach for the electromagnetic (EM) analyses of a hypersonic object with plasma sheath, where the effective EM parameters of the plasma flow were constructed by solving the Navier-Stokes fluid dynamics equation combined with proper thermochemical models.Abstract:
In this paper, we present a rigorous numerical approach for the electromagnetic (EM) analyses of a hypersonic object with plasma sheath. First, the effective EM parameters of the plasma flow are constructed by solving the Navier–Stokes fluid dynamics equation combined with proper thermochemical models. Then, the EM characteristics of the hypersonic complex are examined by the method of moments based on the volume–surface integral equations. Both the fluid field properties and the associated EM effects are analyzed for a real sphere–cone object that flies at a hypervelocity of 7650 m/s and at an altitude of 61 or 71 km. The impacts of the plasma sheath on the propagation, scattering, and radiation properties are discussed. The plasma sheath may block the transmission and radiation of radio waves for a wide range of frequencies, as the attenuation may exceed 20 dB. Also, the plasma sheath may influence the backscattering radar cross section to an extent of 20 dB. As the frequency increases, the effects tend to weaken and eventually may be ignored beyond 50 GHz. The simulation results are found in good agreement with available experimental data, which indicates that the proposed approach is reliable for predicting the level of radio blackout.read more
Citations
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Journal ArticleDOI
Analyzing the Electromagnetic Scattering Characteristics of a Hypersonic Vehicle Based on the Inhomogeneity Zonal Medium Model
TL;DR: In this article, a new electromagnetic (EM) calculation model, the inhomogeneity zonal medium model (IZMM) based on the physical optics (PO) method, is proposed to calculate and analyze the EM scattering characteristics of hypersonic vehicle covered with a plasma sheath.
Journal ArticleDOI
Simulation and Feature Extraction of the Dynamic Electromagnetic Scattering of a Hypersonic Vehicle Covered with Plasma Sheath
TL;DR: Using the angle-time conversion method, the dynamic radar cross section (DRCS) of the vehicle in horizontal flying path and different flying states is solved and the different kinds of statistical eigenvalues extracted from DRCS will play an important role in hypersonic targets classification and recognition.
Journal ArticleDOI
Toward the Nonstationary Theory of a Telecommunication Channel Through a Plasma Sheath
TL;DR: In this article, an analysis of dynamic processes for the electromagnetic wave packet passing through the opaque media with quasi-free charges is presented, and the peculiarities of tunneling through the nonstationary plasma layer are analyzed.
Journal ArticleDOI
Accurate and Efficient Finite-Difference Time- Domain Formulation of Dusty Plasma
Yong-Jin Kim,Kyung-Young Jung +1 more
TL;DR: In this article, the authors proposed an accurate and efficient FDTD formulation for dusty plasma, based on the bilinear transform (BT), and performed a comprehensive study on the numerical permittivity and the computational efficiency for three FDTD formulations.
References
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Journal ArticleDOI
A tetrahedral modeling method for electromagnetic scattering by arbitrarily shaped inhomogeneous dielectric bodies
TL;DR: In this article, a volume integral equation is formulated and solved by using the method of moments for calculating the electromagnetic scattering from and internal field distribution of arbitrarily shaped, inhomogeneous, dielectric bodies.
Journal ArticleDOI
Computation of weakly ionized hypersonic flows in thermochemical nonequilibrium
TL;DR: In this article, a numerical method to compute a two-dimensional hypersonic flowfield that is weakly ionized and in thermochemical nonequilibrium has been developed, described by coupled partial differential equations for the conservation of species mass, mass-averaged momentum, vibrational energy of each diatomic species, electron energy, and total energy.
Proceedings ArticleDOI
On convergence of computation of chemically reacting flows
TL;DR: In this paper, the conservation equations governing chemical species and vibrational and electron energies are solved simultaneously with those for overall mass, momentum, and energy for a one-dimensional subsonic flow, through a constant-area duct, originating behind a normal shock wave, using an implicit time-marching technique.
Journal ArticleDOI
Progress in Reentry Communications
James P. Rybak,R. J. Churchill +1 more
TL;DR: In this article, a summary of the causes and effects of the reentry plasma sheath is presented, together with a discussion of reentry plasminarity diagnostic techniques, proposed methods of alleviating the communications blackout, and a review of various reentry flight experiments.