Method for calculating propagation characteristics of Gaussian beam in anisotropic hypersonic plasma turbulence
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An anisotropic, hypersonic technology, applied in the field of electromagnetic waves, can solve problems such as anisotropic plasma turbulent light and electromagnetic wave propagation, which are rarely studied
Pending Publication Date: 2022-04-05
ANHUI UNIVERSITY
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[0004] To sum up, there are many theoretical foundations based on atmospheric turbulence research, and some work has been done on non-Kolmogorov power spectrum based on plasma turbulence, but there are few studies on the propagation of light and electromagnetic waves in anisotropic plasma turbulence.
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Embodiment 1
[0066] Such as Figure 1-2 As shown, a method for calculating the propagation characteristics of Gaussian beams in anisotropic hypersonic plasma turbulence includes the following steps:
[0067] Step S1. Obtain the anisotropic hypersonic plasma turbulent refractive index fluctuation power spectrum Φ(κ) and introduce two anisotropy factors, and use the two anisotropy factors to adjust the anisotropy of the turbulence unit in the horizontal and vertical directions characteristics, and obtain the refractive index fluctuation power spectrum with two anisotropy factors Φ(κ x ,κ y );
[0068] Among them, according to the experimental results of the hypersonic flow field, the von Kármán spectrum model is corrected to obtain the power spectrum expression of the anisotropic hypersonic plasma turbulent refractive index fluctuation, and the anisotropic hypersonic plasma turbulent refractive index fluctuation power spectrum Φ( κ) is expressed as:
[0069]
[0070] in, ξ x and ξ ...
experiment example 1
[0142] Experimental simulation conditions
[0143] The parameters of plasma turbulence are chosen as follows: Gaussian beam, beam width W 0 =0.01m, wave number k=1.25×10 5 / m, variance of refractive index fluctuation Anisotropy parameter ξ y =1, turbulent outer scale L 0 =0.3m, Reynolds number R e =5.06×10 3 / m.
[0144] Analysis of results
[0145] In simulation experiment 1, the present invention is used to simulate and calculate Gaussian beam broadening distribution in anisotropic plasma turbulent flow.
[0146] The results are shown in Figure (3), Figure (4), Figure (5) and Figure (6). From the comparison of the four figures, it can be seen that the long-term beam broadening decreases with the increase of the anisotropy parameter. The increase of the inner scale, the decrease of the variance of the refractive index fluctuation and the increase of the outer scale decrease.
[0147] It shows that increasing the anisotropy of turbulent flow can reduce the effect of ...
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Abstract
The invention relates to a method for calculating propagation characteristics of Gaussian beams in anisotropic hypersonic plasma turbulence, and the method comprises the steps: solving long-term beam broadening and flicker indexes of the Gaussian beams in the anisotropic plasma turbulence according to a refractive index fluctuation power spectrum of the anisotropic plasma turbulence and a Rytov approximation theory; two anisotropic factors are introduced to parameterize anisotropic characteristics of a turbulence unit in horizontal and vertical directions, long-term beam broadening and flicker indexes are simulated, and finally propagation characteristic data of Gaussian beams in anisotropic hypersonic plasma turbulence are obtained. According to the method for calculating the propagation characteristic of the Gaussian beam in the anisotropic hypersonic plasma turbulence, the defect of the propagation characteristic of the Gaussian beam in the anisotropic hypersonic plasma turbulence is overcome, so that the wave propagation problem in the hypersonic plasma turbulence is not only based on isotropy, but also based on the Gaussian beam propagation characteristic in the anisotropic hypersonic plasma turbulence. And a theoretical basis is provided for an electromagnetic wave propagation problem in subsequent plasma turbulence.
Description
technical field [0001] The invention belongs to the technical field of electromagnetic waves, and in particular relates to a method for calculating the propagation characteristics of Gaussian beams in anisotropic hypersonic plasma turbulence. Background technique [0002] Over the years, scientists have studied hypersonic vehicles more and more widely, as aerospace engineering and military defense have significantly increased their status in various countries. The plasma sheath will be formed on the surface of the high-speed aircraft. According to the hypersonic flow field experiment, there is a serious turbulence effect inside the plasma sheath. The hypersonic plasma turbulence will cause the amplitude and wavefront phase of the electromagnetic wave to fluctuate randomly, resulting in the occurrence of transmission signals. Distortion will seriously affect the relay communication between the aircraft and the ground, causing the phenomenon of "black barrier". Therefore, it ...
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