泄洪洞中墩水翅现象的试验研究  

Experimental study on water-wing phenomena for middle-piers of discharge tunnels

作　　者：纪伟[1] 吴建华[1] 阮仕平[1] 

机构地区：[1]河海大学水利水电工程学院,江苏南京210098

出　　处：《河海大学学报（自然科学版）》2007年第1期18-21,共4页Journal of Hohai University(Natural Sciences)

摘　　要：为了研究泄洪洞中墩的水翅问题,设计了2种中墩方案并进行了1∶40的水工模型试验.试验结果表明:(a)单洞结构尺寸较大的泄洪洞在进口段加设中墩后,由于水头高、流速大,会发生水翅冲击顶部和边墙的现象,并会对泄洪洞的安全运行构成威胁;(b)水翅现象与中墩的几何参数和水面下凹深度和长度有关,水翅长度随中墩长度的减小和水面下凹长度的增加而增加,水翅高度随中墩长度的减小和水面下凹深度的增加而增加;(c)水面下凹深度与中墩几何参数也有密切关系.Two schemes for middle-piers were designed, and hydraulic model tests with the scale of 1：40 were performed to investigate the water-wing phenomena. Some conclusions are drawn as follows： the placement of middle-piers at the inlets of single-passage, large size discharge tunnels may lead to the occurrence of water-wings, which strike the top and side wall of the tunnels due to high water head and high flow velocity and threaten the operation of the discharge tunnels; the water-wing phenomenon is closely related to the geometric parameters of the middle-piers and the extent of concavesurfaces around the end of the middle-piers, and with the decrease of the length of the middle-piers and the increase of length of the concave-surfaces, the length of water-wings increases, while the height of water-wings increases as the length of the middle-piers decreases and the depth of the concave-surfaces increases; the extent of the concave-surfaces around the end of the middle-piers is also closely related to the geometric parameters of the middle-piers, and the longer the middle-piers, the greater the depth of the concave-surfaces.

关 键 词：泄洪洞 中墩 水翅 水面下凹 

分 类 号：TV135.2[水利工程—水力学及河流动力学]