不同梯坎尺寸下溢洪道消能段相对流速与相对弗汝德数的关系

The relationship between relative flow velocity and relative Froude number of the spillway dissipation segment in different terraced sizes

为准确地反映梯坎尺寸变化对溢洪道消能段相对流速与相对弗汝德数关系规律的影响,选择重庆柏叶口水电站溢洪道为研究对象,设置0.47m、0.94m、1.83m、3.75m、7.50m五组不同梯坎高度的方案,并借助物理模型试验,将这五组方案依次反映至物理模型中,通过概化试验进行对比分析。研究结果显示:非均匀流流态下相对流速和相对弗汝德数表现出良好线性关系,相关系数高达0.985～0.992;梯坎高度对相对流速和相对弗汝德数表现出的直线倾斜幅度几乎没有影响。

To confirm accurately the relationship between the relative velocity and Froude number which is influenced on different terraced sizes of the spillway dissipation segment, in this paper the Chongqing baiyekou hydropower engineering was taken a test example and the physical generalization model experiment was adopted to analyze 5 different terraced sizes that was respectively 0. 47 m, 0. 94 m, 1.83 m, 3.75 m and 7. 50 m. The conclusion showed that the relative flow velocity in the non-uniform flow regime had a good linear relationship with the relative Froude number, and its correlation coefficient was as high as 0. 985-0. 992. The height of the ladder had little effect on the straight line inclination of between the relative velocity and the relative Froude number.