中文摘要：

采用数值模拟方法,使用流函数和拉格朗日相关结构对由2种生长机制所得涡环的典型物理特征进行分析.结果表明：由2种生长机制所得涡环均属于薄核涡环,其涡核的涡量分布满足高斯分布,并且具有统一的物理模型;但由于2种涡环生长过程中的环境差异而导致其运动学特征存在差异,主要表现在涡环的传输速度和无量纲涡核半径有所不同.

英文摘要：

Numerical methods were used to simulate the formation of vortex rings while the methods of stream function and Lagrangian coherent structures were applied to analyze the physical characteristics of vortex rings.It is found that the vortex rings generated by two mechanisms belong to thin core vortex.The distribution of vorticity in core is Gauss distribution which has a unified model.Due to the difference between formation environments,there are several differences between kinematics characteristics,mainly in transportation velocity and nondimensional core radius.Thus,the pure vortex rings generated by piston can reveal the mechanism of the flow over a body which is like disc and airfoil.