分层流体中物体运动尾迹的理论和实验研究

Theoretical and Experimental Research on the Wake of a Moving Body in Stratified Fluid

论文应用数值计算和实验两种方法研究了重力分层流体中运动物体与自由面的相互作用 .数值计算表明 ,用Rankine卵形体模拟潜艇 ,在通常潜艇运动的条件下 ,重力内波在水面上形成的尾迹较弱 ,但仍然具有可以识别的特征 .实验研究是在静水槽中进行的 ,分层介质为水 盐水以及柴油 盐水两种情形 .实验结果表明 ,物体在密度突跃层附近运动时导致自由面发生特定的变形 .论文还讨论了物体的位置和运动速度等因素对变形形态的影响 。

Numerical computation and experimental techniques are applied to the investigate of the interaction of a moving body with free surface in the stratified fluid. The numerical results show that modeling a submarine by the Rankine ovoid and under the normal moving conditions of a submarine, the wake on free surface produced by the internal gravity wave is very weak, but has a distinguishable pattern. The experimental research was conducted in a water tank, and the stratified fluids were composed of water brine or water diesel oil. The experimental results show that a typical deformation of free surface is produced when the small sphere is towed near this thermocline. The effects of the sphere's position and its moving speed on the deformation are discussed. The thermocline deformation is also described.