Simulation method for electromagnetic characteristics of plasma sheath of hypersonic aircraft

Abstract

The invention discloses a simulation method for electromagnetic characteristics of a plasma sheath of a hypersonic aircraft. The method comprises: firstly, conducting fluid simulation according to the geometric shape and flight parameters of the hypersonic flight vehicle, and determining plasma collision frequency, plasma oscillation frequency and electron cyclotron frequency parameters of all positions of a space under the condition that an electromagnetic field is applied according to simulation information; then extracting a grid file of a plasma target, and setting incident electromagnetic wave parameters; calculating the current density of a plasma medium part in an area by using a plasma iteration method, calculating the current density of an interface between the plasma medium and air by using a magnetic field boundary condition, and carrying out iteration updating by using a current density vector single-step updating formula; and finally, analyzing the time domain waveform to obtain the plasma electromagnetic characteristic. The method has the advantages of being simple in programming and high in calculation efficiency, and efficient analysis on the plasma sheath of the hypersonic flight vehicle is achieved.

Description

technical field [0001] The invention relates to the technical field of electromagnetic simulation, in particular to a method for simulating electromagnetic characteristics of a plasma sheath of a hypersonic aircraft. Background technique [0002] When the aircraft flies at super-sonic speed, the surface of the aircraft generates intense friction with the air and squeezes the surrounding air. The air near the aircraft is in a viscous state, forming a high-temperature area with a temperature of several thousand Kelvin, which ionizes the surrounding air and forms High temperature and high pressure plasma sheath. Typically, the electron density in the plasma sheath can reach 10 16 ~10 18 m -3 . High electron number density will have a serious negative impact on aircraft communication, so it is necessary to use numerical methods to analyze the propagation characteristics of electromagnetic waves in the plasma sheath to provide a technical basis for the realization of hyperson...

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Problems solved by technology

[0003] At present, using the finite difference time domain method to analyze the electromagnetic characteristics of the hypersonic vehicle plasma sheath, there are two problems: (1) It is difficult to realize the efficient simulation of the magnetized plasma with high cyclotron frequency: because the Nyquist sampling theorem requires that the existing finite difference method The current density, electric field, and magnetic field time step are small enough, so that it is difficult to realize the electromagnetic simulation of the plasma efficiently; (2) it is difficult to deal with the interface between the plasma medium and the air, and it is easy to cause the numerical instability at the boundary, so that the Simulation of electromagnetic properties of plasma media is difficult to achieve

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