判别泄洪洞反弧段发生空蚀的水力特性标准

 搜集了国内外已建工程龙抬头式泄洪洞的运用情况共22例， 对其中一些工程发生空蚀破坏的原因、条件进行了综合分析。提出可以用泄洪洞作用水头、反弧末端平均流速及反弧段水流空化数等3项水力特性的界限值， 作为判别龙抬头式泄洪洞反弧段是否会发生空蚀的水力特性标准。

Discriminating Standard of Hydraulic Characteristics on Cavitation Damage at Concave Reach of Tunnel Spillway

Twenty two practical engineering examples of existing tunnel spillways collocted from at home and abroad are introduced in this paper. Comprehensive analyses from conditions and causes of the cavitation damage at the concave reach for some destructed engineerings among them are performed. Three hydraulic characteristic limit values of the head, velocity and cavitation index at the bucket of tunnel spillway are provided, which are used as discriminating standard of cavitation standard.