Abstract
The submarine is usually affected by free surface and the navigation resistance increases when sailing near the surface. In order to study the specific resistance characteristics of submarine sailing near the surface, the SUBOFF with appendages was taken as the research object, and the calculation model was built based on Star CCM+ fluid simulation software, and the resistance coefficients under different submarine depths and speeds were calculated. Through comparative analysis, the influence of the depth and speed of the submarine on the resistance components was obtained, and the cause of the formation was analyzed. The results show that the influence of the depth of submarine on friction resistance coefficient is small in general. With the increase of the depth of the submarine, the pressure resistance coefficient decreases, and the wave amplitude decreases. The shear wave of Kelvin wave system is more obvious and the effect of scattering is weakened, which is of great significance for the study of submarine concealment. With the increase of speed, friction resistance coefficient decreases, the overall change trend of pressure resistance coefficient is first increased and then decreases. The interference effect between free surface and hull increases first and then decreases at each depth. The wave shape changes and resistance results mutually confirm. The free surface mainly generates waves by interacting with the hull, which affects the resistance characteristics of the submarine. The interference effect is greatly affected by the depth and speed of the submarine.
Highlights
As an important weapon to stabilize coastal defense, modern submarines have the characteristics of large combat radius, strong assault power and good concealment
Today's mainstream conventional submarines usually use diesel electric power, which can be generated by diesel engine in the state of water or underwater ventilation pipe, stored in the battery, and use the electric energy of the battery to sail
Compared with large-depth diving, when the submarine is sailing near the water surface, the free surface will have a great impact on its navigation performance
Summary
As an important weapon to stabilize coastal defense, modern submarines have the characteristics of large combat radius, strong assault power and good concealment Their concealment is mainly realized by diving in tens or even hundreds of meters of water depth. Due to the need of concealment, after sailing underwater for a period of time, the conventional submarine generally floats to the underwater vent pipe and starts the diesel engine for charging At this time, the submarine is sailing near the water surface. Based on the research of the above scholars, for the SUBOFF model with appendages, this study uses Star CCM + software to numerically analyze the resistance characteristics of near surface navigation, calculate the dimensionless friction resistance, pressure resistance and total resistance coefficient under different depths and speeds, focus on the impact of depths and speeds on each resistance component, and analyze the waveform characteristics. As to further clarify the specific influence of free liquid on the resistance characteristics of submarine
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