Method of evaluation of the radial distribution of the refractive index spectrum in axisymmetric supersonic jet from laser transillumination results

摘要

In the report the algorithm of determining of the radial dependence of the refractive index spectrum in an axially symmetric jet from the intensity fluctuations of translucent laser beam is presented. The relationship between the spatial spectrum of inhomogeneities of air density and temporal power spectrum of the diaphragmed laser radiation and the distribution of mean flow velocity over the cross section of the jet are used for refraction index spectra recovery. The relations allowing to determine the shape of the spectrum of the inhomogeneities from temporal spectra of the intensity fluctuations of laser radiation passed through the jet at different distances from its axis are obtained. Results of numerical experiments demonstrate the performance of the proposed algorithm.