论文部分内容阅读
本文介绍泄洪道气蚀损坏位置的一种计算方法。此法所用的经验曲线把气蚀破坏作为运行时间的函数来估算。文中还介绍了能保护泄洪道免遭气蚀损坏的掺气槽的设计。气蚀破坏不是个新问题。早在1915年气蚀就已是垦务局所设计的泄水孔工程中需要维护的原因,最早的严重气蚀破坏是产生于明渠水流中。“Hoover”坝的“Arizona”隧洞泄洪道运行四个月之后,在砼衬砌里发现了一个大孔。孔长34米,宽19米,最大深度达11米。
This article describes a calculation method for the damage location of spillway cavitation erosion. The empirical curve used for this method estimates cavitation damage as a function of running time. The article also describes the design of aeration tanks that protect spillways from cavitation damage. Cavitation damage is not a new problem. As early as 1915, cavitation erosion was the cause of the need for maintenance of scuppers designed by the Bureau of Reclamation. The earliest serious cavitation damage was caused by the open channel flow. Four months after the “Arizona” tunnel spillway of the “Hoover” dam was run, a large hole was found in the concrete lining. Hole length of 34 meters, 19 meters wide, the maximum depth of 11 meters.