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It is important to study the water surface infrared characteristics caused by the hot wake of the underwater vehicle from the perspective of infrared radiation for submarine detection. At present, most of the experimental water environments on surface infrared characteristics are set up as uniform environments or ideal linear temperature stratified environments. However, the temperature distribution environment of the real sea is complex and diverse, and further improvement of the water environment is still needed to obtain more realistic results. Therefore, this paper constructs a nonlinear temperature stratified environment that conforms to the real water environment, and conducts numerical simulations and experimental validation in this environment to observe the infrared characteristics of the water surface. The results show that in the nonlinear temperature stratified environment, the submarine will produce cold wake phenomenon. Compared with the uniform temperature environment in the same working condition, the wake is longer and less likely to dissipate, and the surface infrared characteristics can be detected more obviously in the non-linear.
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