Variation of Discharge Coefficient of Spillway and Broad Crested Weir Due to the Effectiveness of the Longitudinal Slope in a Non-horizontal Channel  

作　　者：Sadiq Salman Muhsun 

机构地区：[1]Department of Environmental Engineering, Al-Mustansiriya University, Baghdad 0964, Iraq

出　　处：《Journal of Environmental Science and Engineering(A)》2014年第5期287-295,共9页环境科学与工程（A）

摘　　要：In this work, experiment efforts were devoted to study the effect of the longitudinal slope of channel on the discharge coefficient for ogee spillway and broad crested weir. A comprehensive laboratory study including 17 tests was conducted to estimate the variation of the discharge coefficient due to variation of the longitudinal slope. It was shown that the discharge coefficient is significantly increasing with the increase of the slope by more than 90% or 75% and 80% or 70% for weir and spillway in case of excluding or including the approach velocity head, respectively. Also, CFD （computational fluid dynamics） with a help of Comsol-multyphsics program was used to simulate the problem. The program explained that the linear distribution of the hydraulic pressure changes to a non-linear distribution as the longitudinal slope is considered. Consequently, the values of the discharge coefficient are also affected.

关 键 词：Coefficient of discharge non-horizontal channel SPILLWAY broad crested weir CFD. 

分 类 号：TV66[水利工程—水利水电工程] TV651.1