In case of the turbine is operated departing the optimum condition, the low presure and the vortex band will be established in the draft tube centre by the flow circulation.
水轮机在偏离最优工况运行时，水流的环量会使尾水管中心产生低压并形成涡带。
The calculated results indicate that the across-wind loads of high-rise buildings with square sections are induced mainly by vortex shedding and are narrow-band random processes.
得到如下结论：高层建筑横截面为方形时，其横风向风荷载主要由规则性旋涡脱落导致的尾流激励构成，为窄带随机激励；
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