【摘要】 自然界中绝大部分运动都是有旋的,涡旋现象是流体力学研究的一个重要方向。本文通过实验室实验中对涡旋现象进行研究,具有参数可控、现象直观可见、可获取三维数据场等优势。但是考虑到真实海洋中存在的的海洋层结、地转效应,通常使用的实验室造涡方法存在着破坏层结、涡旋结构不稳定等缺陷。本实验提出了一种定常涡旋的生成方法,可以在旋转层结流体中生成一个稳定的涡旋。通过此种方法生成的涡旋,速度与涡度分布径向分布遵循不同的规律,垂向上都沿统一的指数规律衰减,且涡度径向分布可以用一简单解析函数拟合。更多还原

【Abstract】 Most motion of the fluid in the nature is rotational,and vortex phenomenon is an important direction in the study of fluid mechanics.The research on the vortex phenomenon via laboratory experiment allow us to adjust the experimental parameters within the allowable range,easily access to visual phenomena,and have the advantages of being able to obtain three-dimensional data fields.However,considering the fact that the existence of stratification and geostrophic effects in the real ocean,the commonly used laboratory vortex induced methods have some defects such as the destruction of stratification and the instability of vortex structure.When it comes to apply experimental results to real ocean simulation,those defects may be hard to ignore.A steady vortex generation method is proposed in this paper,which can generate a steady vortex in a rotating stratified fluid.Vortex generated by this method,its radial distributions of velocity and vorticity follow different rules,and the vertical distributions of those decrease along the uniform exponential law.The vorticity radial distribution can be fitted by a simple analytic function.更多还原