C形起动时鱼尾模型的流场结构

Flow structure of fish tail models in C-starts

在活鱼观察实验的基础上,用对称和非对称两种模型模拟了鱼类尾鳍C形起动时周围的流场结构,测量了模型受到的力和力矩.通过氢气泡和PIV方法研究了对称和非对称尾鳍C形起动时产生的旋涡结构特征;通过涡量矩理论定性分析了旋涡流场结构与C形起动模型动力学特征的关联.

Based on the observation tests of living fish, two types ot models, symmetrical and asymmetrical, were used to simulate the flow structure of fish tail in C-starts. Furthermore, the force and moments of models were measured. Two methods of the H2 bubble and PIV （particle image velocimetry） technique were selected to visualize the vortex structure around the tail models in C-starts and the vorticity-moment theorem were used to analyze qualitatively the vortex field and its correlation with the dynamic feature of the models in C-starts.