通气位置对潜射航行体流体动力特性影响分析

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

基于均质平衡流理论,通过求解混合介质的RANS方程、SST湍流输运方程和各相之间的质量输运方程,开展了通气位置对潜射航行体流体动力特性影响的三维数值模拟研究,对比分析了不同通气位置条件下空泡形态特性、表面压力分布以及阻力变化特性.结果表明:当两个通气口间距增加到一定值后,在两个通气口之间区域空泡发生断裂,在断裂区域迎流面和背流面表面压力值升高,且在空泡断裂闭合位置出现压力峰值;在相同通气量条件下,随着通气口间距的增大,压差阻力系数和粘性阻力系数均呈减小趋势变化.

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.