水下气泡群运动特性及其三维数值模拟研究

Research on Movement Characteristic and 3D Numerical Simulation of Many Bubbles in Water

在对水下单气泡运动受力分析及任意时间剖面多气泡运动特性研究的基础上,建立了水下气泡群运动数学模型。提出了一种基于时间剖面的分析方法,通过改进的RKF方法对各时间剖面进行求解,获得水下气泡群三维运动特性,发现出口处各随机气泡在脱离后,在很短时间内铅垂方向速度均达到一定值但有较小波动,水平各向速度随即趋于0 ;从运动轨迹分析看,相邻气泡碰撞几率很小。

Based on the force analysis of single bubble movement and movement characteristic research of many bubbles in random time section, the mathematics modeling of many bubbles movement was built up. A method based on time section analysis was put forward. The modeling was solved based on improved RKF method and three-dimension movement characteristic of the bubbles was obtained. The research results reveal that the randomicity position bubbles move upwards in little time after deviating exhaust port and the upright orientation velocity achieves a less fluctuate round fixed value soon and level orientation velocity tends to 0. The movement contrails show that the probability of collision and conglomeration of contiguity bubbles are little.