舰船气泡尾流特性的数值模拟和实验研究

文章基于N-S方程,并结合两相流的相关模型,数值模拟了双桨实船气泡尾流。通过海水中气体含量的变化情况,分析了尾流气泡产生、增大、破碎和消失等过程。得到了近场扩散区和远场尾流区中含气量的空间、时间分布特性。研究结果表明,近场尾流区中海水含气量基本以乘幂格式衰减,而在远场尾流区,则与指数衰减格式符合得较好。用光学的方法模拟测量了舰船尾流的衰减规律,实验结果与文中的理论数值结果一致。

Numerical simulation and experimental study of a ship' s bubble wake

Based on N-S equation and two-phase model, the wake of a two-propeller ship is simulated. The bubble’s birth, growth, break up and death can be analized though the volume fraction of the vapor in the sea water. The time and space charactes of the near field and far field are obtained. The results show that in the near field of the wake, the volume fraction of the vapor attenuates as the power law, and in the far field of the wake, the volume fraction of the vapor attenuates as the exponent law.The optics experiment is carried out and the results are consistent with the simulation results.