南水北调中线工程槐河(二)渡槽水力特性试验研究

Hydraulic Property Experiment of Huai River(II) Aqueduct in Middle Route of South-to-North Water Transfer Project

南水北调中线总干渠上渡槽等建筑物上的分配水头有严格要求。为选取经济合理的渐变段型式和管理调度运用方式,需通过水工模型试验对原设计渡槽的进出口连接型式和渡槽的运用方式进行优化。该试验通过对渡槽进、出口不同墩头形状和上、下游渐变段不同型式的研究比较,认为在缓流状态下,流线型墩头和圆型墩头的水头损失基本相同。设计流量下进口直线扭曲面型渐变段的水头损失系数小于反弯扭曲面型渐变段的水头损失系数,出口直线扭曲面型渐变段的水头损失系数与反弯扭曲面型渐变段的水头损失系数基本相同。渡槽单联过水时过流量不宜太大,闸门开启时第一开度不宜过大。试验成果可供同类工程设计参考。

There is a strict request on the water head allocation of aqueduct in main channel of Middle Route of North-South Water Transfer Project. For choosing economically and suitable transition type and management scheme, it should to be optimized the original design of connection type of out-inlet of the aqueduct by hydraulic model test. This test has compared with different types of in-outlet pier and up-down stream transi- tion,considers that under slow-flow, the head loss of streamline and circular are almost same. The head loss coefficient of down inlet linear transition is less than tortile transition and those above of outlet almost same. When flume discharged at single side, its excess flow should not be too large. This test also can give reference to same type projects.