Aeroptical effects caused by supersonic airflow around an ogival body
A.A. Sukharev
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634055, Russia
Keywords: оживальное тело, средняя интенсивность, однородная среда, ogival body, mean intensity, homogeneous medium
Abstract
An optical model of a shock wave formed due to supersonic airflow around a body of an ogival form is developed. Mean values of airflow parameters were calculated from the Navier-Stokes equations using the CFD Fluent 6.0 software package, taking into account the compressibility of the gas. It is shown that the maximum values of the structural characteristic are several orders of magnitude larger than the values typical for the unperturbed shock wave of the atmosphere. Results of calculation of the mean intensity and deviation from the rectilinear direction of propagation of the optical beam crossing a shock wave at the beginning of a path in a homogeneous medium are presented. It is shown that an increase in the aircraft speed leads to an increase in the transverse dimensions of the beam due to diffraction. Magnitude of angular displacements of a beam crossing the shock wave depends only on the altitude above the Earth's surface at which the shock wave is formed. The impact of shock wave on the crossing beam decreases as the altitude increases.
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