水力发电学报2012，Vol.31Issue(4)：113-118,124,7.
台阶式溢流坝后消力池压强特性
Pressure characteristics in stilling basin of stepped spillways
摘要
Abstract
Through physical model tests, this work studies behaviors of pressures, i. e. time-average pressure, peak hydrodynamic pressure and pressure fluctuating intensity, on the stilling basin floor of stepped spillways under three different chute slopes, and puts forth empirical formula for calculation of average pressure. Results show that peak average pressure, peak hydrodynamic pressure and maximum pressure fluctuation occur at the jet nape impinging location x/hk = 1. 2 - 2.5. These peak values increases as the chute slope or flow rate increases. An average pressure peak of yp/hk = 5.4, a hydrodynamic pressure peak of 5 ～ 8 times the average value, and a fluctuating intensity peak of 80% of average pressure, were measured. The lowest pressure appears around x/hk = 2. 5 - 5. 1, and occasional negative values of average pressure may show up. The dominant frequencies of fluctuations are 4Hz -8Hz in impinging zone, 2Hz -5Hz in hydraulic jump roller zone, and generally below 2Hz downstream of the hydraulic jump.关键词
水力学/压强特性/模型试验/消力池/台阶式溢流坝Key words
hydraulics/pressure characteristics/model test/stilling basin/stepped spillways ,分类
建筑与水利引用本文复制引用
田嘉宁,赵庆,范留明..台阶式溢流坝后消力池压强特性[J].水力发电学报,2012,31(4):113-118,124,7.基金项目
陕西省教育厅基金 （）
西安理工大学博士基金 （）
