水下运动体气泡热尾流浮升过程的理论分析

Theoretical analysis of buoyant process of bubbly thermal wake behind body going underwater

在具有垂直温度梯度和微小气泡的海水中,建立了水下运动体气泡热尾流的连续方程、动量方程和热平衡方程,获得了气泡热尾流的浮升规律和扩展规律。结果表明:从17 m深处到海面,气泡热尾流的浮升速度、浮升高度、浮升角度、温度扩展半径和轴线温度受气泡大小的影响比较显著;但从30 m深处到海面,气泡热尾流的速度扩展半径和轴线速度几乎不受气泡大小的影响。

The continuity equation, the momentum equation and the heat equilibrium equation of the bubbly thermal wake behind a body going underwater was established for the seawater with the vertical temperature gradient and tiny air bubbles. The buoyant law and expansive law of the bubbly thermal wake were obtained. The results show that the buoyant velocity, the buoyant height, the buoyant angle, the temperature expansion radius and axial temperature of the bubbly thermal wake are remarkably influenced by the size of the bubble in the wake from a depth of 17 m to the surface. However, the velocity expansion radius and the axial velocity are hardly affected by the size of the bubble from a depth of 30m to the surface.