【摘要】 龙抬头范围越大、水流越平顺、流态越好 ,但工程量越大。本文通过对“┓”型龙抬头试验研究、验证了避免水流急剧变化而产生空蚀的较有效的方法是 :缩小中间闸门井的过流断面。在泄洪量不太大、边壁流速控制在混凝土允许抗冲流速内 ,可以在非常苛刻的条件下设计龙抬头 ,以缩小该段范围 ,为后期导流洞改建泄洪洞节省工程量及投资。更多还原

【Abstract】 The larger the size of ski-jump energy dissipator is the smoother the water flow is and the better the flow pattern is, but, the larger the construction quantities are. The test and verification of the Z-shaped ski-jump energy dissipator has proved that the reduction of the overflowing cross section of the middle gate shaft is an effective means to avoid cavitation that may be caused due to rapid variation of water flow. The ski-jump energy dissipator can be designed on the very harsh terms to reduce the size of the ski-jump energy dissipator section, thus reducing the construction quantities and investment in changing the river diversion tunnel into a spillway tunnel at later stage provided that the flood discharge is not too large and the flow velocity along side walls could be controlled within concrete permissible erosion resistance one.更多还原