台阶式溢洪道流速水头沿程变化研究
发布时间：2018-07-13 14:22
【摘要】：水流的流速水头是重要的水力参数,可一定程度上反映水流的能量。为研究台阶溢洪道过流断面流速水头的沿程变化规律,将其与同体型的光滑溢洪道流速水头进行对比,引入相对流速水头的概念。通过对26.6°、33.7°、38.7°、48.0°四组坡度,0.5、1.0、2.0 m三种台阶高度的台阶式溢洪道,在单宽流量17.25~62.18 m2/s之间进行模型试验研究。结果表明台阶的流速水头沿程呈现曲线规律,关系复杂不便应用;而非均匀流段上相对流速水头与流程长度呈现良好的线性递增关系,相关系数R2为0.994 8~0.998 8。台阶部分对水流的阻碍效果随单宽流量的减小增大,而与台阶高度、坡度呈递增关系,其中坡度的影响最显著。试验证实了引入相对流速水头的必要性,为台阶溢洪道水力特性的研究提供了依据。
[Abstract]:The flow velocity head is an important hydraulic parameter, which can reflect the flow energy to some extent. In order to study the variation rule of flow velocity head of step spillway cross section, the concept of relative velocity head is introduced by comparing it with the same shape smooth spillway velocity head. In this paper, four groups of stepped spillway with three kinds of step height of 26.6 掳/ 33.7 掳/ 38.7 掳/ 48.0 掳are studied in the single wide flow rate of 17.25 ~ 62.18 m ~ (2 / s). The results show that the velocity head of the step presents the curve law, the relation is complex and inconvenient to be applied, but the relative velocity head and the flow length of the non-uniform flow section show a good linear increasing relation, the correlation coefficient R ~ 2 is 0.994 ~ (80.998) 898 8, the correlation coefficient R ~ (2) is 0.994 ~ 0. 998 8. The hindrance effect of the step part to the flow increases with the decrease of the single wide flow rate, but it is increasing with the step height and the slope, among which the influence of the slope is the most significant. The experiment proves the necessity of introducing the relative velocity head and provides the basis for the study of the hydraulic characteristics of step spillway.
【作者单位】： 西北农林科技大学水利与建筑工程学院;
【分类号】：TV135.2
[Abstract]:The flow velocity head is an important hydraulic parameter, which can reflect the flow energy to some extent. In order to study the variation rule of flow velocity head of step spillway cross section, the concept of relative velocity head is introduced by comparing it with the same shape smooth spillway velocity head. In this paper, four groups of stepped spillway with three kinds of step height of 26.6 掳/ 33.7 掳/ 38.7 掳/ 48.0 掳are studied in the single wide flow rate of 17.25 ~ 62.18 m ~ (2 / s). The results show that the velocity head of the step presents the curve law, the relation is complex and inconvenient to be applied, but the relative velocity head and the flow length of the non-uniform flow section show a good linear increasing relation, the correlation coefficient R ~ 2 is 0.994 ~ (80.998) 898 8, the correlation coefficient R ~ (2) is 0.994 ~ 0. 998 8. The hindrance effect of the step part to the flow increases with the decrease of the single wide flow rate, but it is increasing with the step height and the slope, among which the influence of the slope is the most significant. The experiment proves the necessity of introducing the relative velocity head and provides the basis for the study of the hydraulic characteristics of step spillway.
【作者单位】： 西北农林科技大学水利与建筑工程学院;
【分类号】：TV135.2
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