细长体截面流态拓扑结构演化及其稳定性分析

应用动力系统的稳定性理论,分析了细长体在不同迎角下截面绕流拓扑结构的演化和稳定性.指出旋成体背涡的发展,导致截面流场拓扑结构变化,而由稳定对称旋涡流态变成不稳定对称旋涡流态,进而再在小扰动下变成稳定非对称旋涡流态是导致旋成体非对称背涡出现的基本历程. 

Topological Structure Evolution and Stability of the Cross Flow Pattern Around a Slender

Topological structure and stability of a slender cross flow at different angles of attack was discussed by the stability theory of dynamic system. It was proved that the development of slender vortices leads to the change of topological structure about cross flow. And it is the change from stable and symmetrical vortices flow pattern to instable and symmetrical vortices flow pattern, and then to stable and asymmetrical vortices flow pattern due to little disturb which leads to the development of asymmetrical slender vortices.