在综述各种玻璃采光顶支承结构的基础上，提出了一种更适合采光顶要求的新型张弦梁结构。
Based on the summarization of all kinds of sustaining structures of glass roof, some modifications of the beam string structures (BSS) were made.
渐缩型间隙在叶片前半轴弦受到上通道涡的抑制，减少了叶顶间隙泄漏涡的强度和范围；
Suppressed by the up passage vortex at upstream side of blade, the intensity and scale of the tip clearance leakage vortex is decreased.
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