Abstract
A plasma sheath is generated on the surface of a hypersonic vehicle during high-speed flight, significantly changing the vehicle’s electromagnetic (EM) characteristics. In this paper, a model of the EM characteristics of a plasma sheath is proposed that combines the flow field and EM wave propagation. A numerical solution for the plasma flow field on the surface of vehicle is obtained using a Computational Fluid Dynamics (CFD) method. Then, the parameters of the field are discretized and input into the open-source Particle-in-Cell (PIC) simulation software EPOCH. This is used to calculate EM wave transmission in the plasma sheath and to analyze the EM properties of the sheath. Most studies that use a PIC method to analyze the EM characteristics need to set the plasma density distribution using the distribution density function. In this paper, the density distribution of the plasma is calculated using a CFD method. This makes the plasma density distribution closer to real plasma sheath, which greatly improves the accuracy and practicality of the simulation model. Moreover, EPOCH is an open-source software, which is easy to obtain and maintain. It modifies code according to requirements, and is highly flexible. This paper provides a convenient and flexible simulation platform for the study of the EM characteristics of a plasma sheath.
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