Abstract
For a high-speed infrared guided missile, the supersonic mixing layer over the optic window causes the aero-optical transmission effects such as target image blurring, jittering, and offsetting. The large eddy simulation is used to simulate flow of the supersonic mixing layer and the ray tracing is used to compute transmission path of the beam passing through a vortex, and three parameters are proposed to evaluate the aero-optical transmission effects of each case. The results show that the larger vortex will cause the more severe optical phase distortion, the weaker far-field peak intensity, and the larger deviation of transmission path. The ray passing through the vortex core usually has the largest deviation if there is no density difference between the upper and lower inlet fluids. A significant finding is that density difference of the two inlet fluids will exacerbate the aero-optical transmission effects Under the premise of pressure matching, a suggestion to reduce aero-optical transmission effects suffered in the practical engineering is that outlet density of the jet should be as close as possible to that of the freestream. In the end, the quantitative relationship between fluid density fluctuation and beam transmission path is derived.
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