Imaging deviation through non-uniform flow fields around high-speed flying vehicles |
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Authors: | Liang Xu Yuanli Cai |
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Affiliation: | 1. School of Electronic and Information Engineering, Xi’an Jiaotong University, No.28 Xianning West Road, Xi’an 710049, China;2. School of Information Science and Engineering, Xinjiang University, No. 14 Shengli Road, Urumqi 830046, China |
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Abstract: | The non-uniform flow field around high-speed flying vehicle “bends” the ray and imposes a deviation at the end of the propagation path. This imaging deviation is a kind of aero-optic effect. In this paper, we catalog the factors that influence the deviation into two classes: the vehicle-related factors and the flowfield-related factors. Flow density computation and density–refractive index conversion are discussed. A backward ray-tracing scheme is proposed. The deviations, the propagation path distances in the non-uniform flow field, and the density distributions along propagation paths for two different flying cases are computed. Three flowfield-related factors should be considered in order to reduce the deviation: the propagation path distance in the non-uniform flow field, which should be as short as possible; the angle of incidence at the freestream boundary, which should be as small as possible; and the density distribution along propagation path in the non-uniform flow field, which should be as flat as possible. |
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