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Numerical study of aero-optical effects at transonic regime around the Tomahawk cruise missile optical system

Authors :

Mahyar Najafian¹ Ali Esmaeili² Kamyab Karbasishargh³

1- دانشگاه فردوسی مشهد 2- دانشگاه فردوسی مشهد 3- دانشگاه فردوسی مشهد

Keywords :

Aero-Optics،Optical Aberrations،Ray Tracing،Computational Fluid Dynamics (CFD)

Abstract :

In this study, due to the presence of temperature and density gradients in the flow field and the formation of turbulent and large vortices during the passage of the flow around the optical system in unmanned aerial vehicles or some cruise missiles, this causes light deviation and refraction, leading to insufficient accuracy in positioning, trajectory deviation in projectiles, and errors in imaging under the systems. In this study, by using of the Gladstone equation, the refractive index field can be extracted from the density field. Then, by using the density field obtained from numerical solution, the ray tracing equation is solved using the 4th order Runge-Kutta method, and the amount of light deviation is extracted. The results show that the aero-optic phenomenon is affected by the turbulence of the flow and the boundary layer, which plays an essential role in optical deviations in the flow field with variable density. the aero-optic phenomenon is small at Mach number less than 0.5, but increasing the Mach number, the deviations and its complexity increase, and also the maximum optical deviations at the leading edge are usually from other parts of the aircraft surface; Due to the maximum pressure, flow separation, etc. is more.

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