【摘要】 基于CFD方法，求解轴对称航行体亚音速入水过程流场的非定常RANS方程，探讨航行体入水速度、入水角和攻角等参数对入水过程流体动力、运动姿态及空泡形态的影响。研究表明：（1）入水速度对入水冲击载荷有显著影响，而且影响入水空泡的长度；（2）入水角主要影响入水冲击阶段的流体动力，对于不同的入水角，在相同的入水距离时，航行体空泡形态除自由面附近外基本保持一致；（3）入水攻角会加剧航行体的姿态变化，严重影响空泡形态；（4）自由面附近的空泡形态受气体流动及压力变化的影响，但入水2倍弹长距离之后的空泡形态受自由面影响较小，可应用理论公式快速计算空泡形态。论文研究成果可为高亚音速入水降载研究提供参考。更多还原

【Abstract】 Numerical simulation of subsonic water entry of an axisymmetric vehicle was carried out by solving the unsteady RANS equations of flow field based on CFD method. Effects of motion parameters, such as velocity, incidence angle and attack angle, on the hydrodynamics and cavity in water entry were discussed.The results are shown below. 1. The velocity of water entry has significant influence on the impact load and the cavity length. 2. The incidence angle mainly affects the hydrodynamics in the impacting stage, and the cavity shapes are almost same except in the part near the water surface, if distance of water entry is identical for different incidence angles. 3. The attack angle will aggravate the change of vehicle attitude and the cavity shape.(4) the cavity shape of water entry near the water surface will be influenced on by gas flow and pressure variation, but the cavity shape after the distance into water being two times of vehicle length will not be affected on by the water surface, and the theoretical formula for water entry cavity could be used for this part of cavity. Results in the paper may provide a reference for the study of the load reduction of subsonic water entry.更多还原