## 4 Experimental Results and Analysis  
### One-Factor Experimental Analysis  
At various tailing test levels, good experimental findings were achieved for all components. Figure 5 shows the submersible temperature difference infrared image, where (a) was imaged at a temperature difference of 18 degrees and (b) was imaged at a temperature difference of 11 degrees. Table 2 shows the statistics of an IR wake rising in calm water. Three sets of data were gathered for each set of experiments in order to decrease errors and mistakes; the arithmetic mean of the experimental data was used as the experimental findings. The arithmetic mean was determined from the findings. In the single-factor wake experiments, under calm water conditions as the dive depth rose, the heat capacity of the cryogenic water above the submersible rose as well. This decreased the central high-temperature region where the heat wake spread up and significantly weakened the infrared radiation properties of the heat wake at the ocean surface, similarly to the results in the literature [19]. Due to the shortest route and shortest diffusion time, the wake came to the surface at a water depth of 20 cm with a significant temperature differential between the wake and the surrounding water column. The wake rose to the surface in a flocculent shape and developed into a long, continuous wake along the surface in the direction of motion as the submarine moved. The contour of the wake did not significantly alter as the depth rose. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Depth/cm** & 20 & 30 & 40 & 50 & 60 & 70 \\ \hline
**AT/\({}^{0}\)C** & 0.76 & 0.61 & 0.52 & 0.33 & 0.30 & 0.24 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Statistics of IR wake rising in calm water. Figure 5: Submersible temperature difference infrared image. Where (**a**) was imaged at a temperature difference of 18 degrees and (**b**) was imaged at a temperature difference of 11 degrees. In order to conduct infrared imaging tests of the wake thermal jet under simulated swell circumstances, the model was designed to establish various swell heights. The swell height was set at 0.3 cm; the distance between the experimental test position and the wavemaker was 3.7 m. When the submersible was submerged to a depth of 30 cm, the infrared camera could clearly capture the abnormal area on the water surface. At that time, the wake thermometer's temperature was 12.43 cm and the average water body temperature was 11.98 cm, with a temperature difference of 0.45 cm. At a depth of 40 cm, The temperature at the temperature measuring point of the wake is 12.46 \({}^{\circ}\)C, the average temperature of the surrounding water is 12.20 \({}^{\circ}\)C, and the temperature difference is 0.26 \({}^{\circ}\)C; When diving to a depth of 50 cm, the phenomenon was still possible. The temperature of the tail track temperature measurement point was 12.40 \({}^{\circ}\)C, while the average water temperature in the area was 12.26 \({}^{\circ}\)C, resulting in a temperature differential of 0.14 \({}^{\circ}\)C.  
When the submersible dove to a depth of 30 cm, the temperature of the wake temperature measurement point was 12.32 cm, the average temperature of the surrounding water body was 11.85 cm, and the temperature difference was 0.32 cm. When the dive depth was 40 cm, the temperature of the wake temperature measurement point was 12.12 cm, the average temperature of the surrounding water body was 11.85 cm, and the temperature difference was 0.32 cm. The infrared camera did not pick up any temperature anomalies in the surrounding water column as the submersible descended to a depth of 50 cm. When the submersible descended to a depth of 20 cm, the thermal jet was able to float to the surface; the wake temperature measurement point was 12.51 cm, the average water body temperature was 11.82 cm, and the temperature difference was 0.69 cm.