舰船尾流气泡运动特性研究

Movement Characteristic of Bubbles in Ship Wakes

建立了气泡在舰船尾流中浮升运动与径向运动的理论模型,针对不同半径、不同气体成分的气泡进行了数值模拟.计算结果表明:泡内气体成分对于半径较大的气泡无明显影响,而对于半径小于50μm的气泡则会产生显著的变化,甚至可能影响气泡变化的趋势;半径小于100μm的微小气泡能在尾流中长时间地存在,且随着气泡半径的减小,气泡在尾流中的存在时间呈指数规律增长,这一结论与实验结果具有较好的一致性.

The movement model of bubbles in the wake of surface ship is built in this paper . Using this model some valuable conclusions are obtained for different kinds of bubbles in diameter and gas component. The results show that the gas component in bubbles will hardly influence the movement of large bubbles and obviously affect the motion of small bubbles especially for bubbles whose radius are smaller than 50. It is also indicated that bubbles whose radius are smaller than 100 can exist in ship wakes for a long time which is consistent with the prevenient experiment results. With the reduction of bubble＇s radius the existing time of bubble in water will increase exponentially.