... warning in advance 预警 收藏 Emergency warning 应急预警; 紧急警告; 紧急警报 收藏 vortex core in draft tube 尾水管涡带 收藏 ...
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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。
This is caused principally by the vortex core of whirling water in the draft tube.
这种振动主要是由尾水管中的旋涡带所致。
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