Propagation characteristics of the Bessel-Gaussian beams in turbulent plasma sheath surrounding the hypersonic aerocraft

Abstract

To investigate the transmission characteristics of the Bessel-Gaussian beams in a turbulent plasma sheath, the flow field around a hypersonic vehicle is numerically simulated and analyzed according to the Navier-Stokes (N-S) equation and turbulence model. Then, utilizing the characteristics of the thickness of the plasma flow field around the supersonic vehicle at the centimeters level, the double fast Fourier transform (D-FFT) algorithm based on the Fresnel diffraction integral is used for the first time to predict the propagation characteristics of the Bessel-Gaussian beams in the turbulent plasma sheath. The results show that the lower the height and the higher the velocity, the smaller the thickness of the plasma sheath shock layer. The refractive index variance, the wavelength and the waist-radius are essential factors affecting the transmission quality of the Bessel-Gaussian beams. When compared to the Gaussian beams, the Bessel-Gaussian beams have smaller drift and scintillation index, which have the advantage in suppressing turbulence.