台阶式泄水建筑物下平底消力池时均压强  

Mean Pressure Characteristics in Stilling Basin on Stepped Spillways

作　　者：田嘉宁[1] 赵庆[2] 范留明[1] 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048 [2]中国水电顾问集团西北勘测设计研究院,陕西西安710065

出　　处：《西安理工大学学报》2010年第3期314-319,共6页Journal of Xi'an University of Technology

基　　金：陕西省教育厅基金资助项目(07JK347);西安理工大学博士基金资助项目(106-210602)

摘　　要：通过水工模型试验,研究了台阶式泄水建筑物在3种坡度下平底消力池底板上的时均压强及其形成的特点。结果表明,时均压强最大值出现在水流冲击消力池底板处,位于xo/h=-0.17～1.8之间,压强水头的比值yp/hk最大可达5.4,其压强随泄槽坡度和流量的增加以及台阶高度的减小而增大;时均压强最小值出现在水流冲击处下游,位于xi/lj=0.09～0.58之间,以远驱水跃时压强最小,其值接近零,偶尔会出现很小的负值。Via the hydraulic structure model tests, this paper deals with the stilling basin floor＇s mean pressure of stepped spillways and its characteristics formed in 3 kinds of gradients. The result shows that the maximum value of mean pressure appears at the place where water flow strikes the stilling basin floor, somewhere between xo/h = - 0. 17 - 1.8, and that the maximum ratio of the pressure head yp/hk can reach 5.4 , whose pressure increases along with the increment of chute gradient and discharge and lowering of the step height; the minimum value of mean pressure appears at the downstream where the water flow impacts, somewhere between xi/lj = 0. 09 - 0. 58, the pressure gets to its lowest when repelled downstream hydraulic jump happens, and the value is close to zero while occasionally extremely small negative values can emerge.

关 键 词：水工结构 时均压强 模型试验 台阶式泄水建筑物 平底消力池 

分 类 号：TV651.1[水利工程—水利水电工程]