fundamental ripple frequency
... 基频轨迹 Pitch Contour 脉动基频 fundamental ripple frequency 基频标准差 FOSD ...
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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。
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.
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