尾空泡对水下航行体流体阻尼力影响数值研究

针对航行体尾空泡对流体阻尼力影响问题，结合动坐标系技术和空泡多相流数值模拟方法，通过求解雷诺平均的NS方程组，进行了阻尼力计算研究。通过与试验数据对比，表明该方法具有较好的精度。数值计算研究表明，尾空泡会削弱航行体尾部压力的不对称性，使航行体尾部流体阻尼力减小。当尾空泡增加到一定尺寸时，流体阻尼力减小幅度逐渐趋缓，同时尾空泡也改变了流体阻尼力随攻角的变化趋势。研究充分表明了航行体流体力设计中考虑尾空泡影响的必要性。

Numerical Research on the Effect of Tail Cavity on Underwater Vehicle Hydrodynamic Damping Force

Based on Reynolds averaged NS equations, combining with rotating reference frames and cavity multiphase flow simulation technique, the influence of tail cavity on underwater vehicle hydrodynamic damping force has been numerical calculated. Compared with experiment result, the validity and accuracy has been proofed. Numerical research indicates that the unbalance of vehicle tail part pressure distribution has been relieved by tail cavity, which causes the reduction of hydrodynamic damping force. As the cavity expands, the decreasing rate trends toward being slow. The tail cavity also changes the shape of attack angle and damping force curves. The research reveals the necessary consideration of the effect of tail cavity on hydrodynamic damping force during underwater design.