短语词组短语crossflow vortices 横流旋涡系Taylor vortices Taylor 涡binary vortices 双涡旋vortices control 涡控制Karmen vortices 卡门涡街tip vortices 端部涡separation vortices 分离涡vortices structure 涡结构cyclonic vortices 气旋性涡旋 返回 vortices