Analysis of the effect of ventilation positions on hydrodynamic characteristics of submarine-launched vehicle

Based on the theory of homogeneous equilibrium flow, by solving the RANS equations of mixture media, SST turbulence transport equations and the mass transport equations between each phase, three dimensional numerical simulation was carried out to study how the positions of ventilation holes impact on the submarine-launched vehicle's hydrodynamic characteristics. The characteristics of the cavity shape, the surface pressure distribution and the drag force change under different ventilation positions were compared. The result shows that the cavity shape is fracturing with the space between two ventilation orifices reaches to a certain value; The surface pressures of the face flow surface and the back flow surface will both increase at the region, and also a pressure peak value will occur at the closing position of cavity; The pressure drag coefficient and the viscosity drag coefficient decreasing gradually show a deceasing trend with the space between two ventilation orifices increasing under the same quantity condition of ventilation.