The unsteady flow in a draft tube of Francis turbine under the off-design operation is produced by the dynamic behavior of a helical vortex rope with the dead core.
混流式水轮机在非设计工况点下运行时，尾水管内部的非定常流动是由死水域和螺旋涡带的动态行为引起的，尾水管上部的螺旋涡带旋转引起流动的基频脉动。
I fell out of a rope swing when I was six years old and I've had a couple motorcycle accidents, so I have to keep my core really strong.
我六岁的时候还从秋千上栽下来过，我有一大堆骑摩托车的事故。
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