石砭峪水库泄洪洞复合圆弧曲线弯管水力特性试验研究

The Experimental Study on the Supercritical Flow With a Free Surface in a Rectangular Bend With Three-centered Arc for Shibianyu Tunnel Spillway

石砭峪水为泄洪洞弯段布置为大底坡急流弯道，为调整其水流流态，进行了水工模型试验。根据隧洞已开挖的现状，又要较好的控制洞内水流流态，试验中曾对弯道体型进行了多次修改比较，其中复合圆复弧变道体型较好的控制了急流弯道水流流态。本文结合该工程试验研究，着重对复合圆弧弯道水流特性及其控制急流效果进行了阐述。并提出了急流弯道的初步选型方法。

The Shibianyu spillway tunnel contains a horizontal rectangular bend with free surface flowand a slope i=0.1,Of the several designs analysed according to the existing excavation status andlaboratory test,the compound bend with three-centered are was finally chosen and can produce fewerdisturbances of shock to minimize the water surface fluctuation.The flow control in this type of bendwere discussed and the approach of hydraulic design was also suggested in this paper.