... kinescope grid 释义：显像管控制栅极 vortex gate 释义：整流栅 double-grid 释义：双栅的 ...
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Besides, a notable vortex rope and a reverse flow structure exist in the draft tube in smaller wicket gate openings, which can easily lead to the instability in operation of the pump-turbine.
此外，发现开度较小时尾水管内存在明显的涡带和回流涡结构，容易导致机组运行的不稳定；
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