Inception Point and Air Concentration in Flows on Stepped Chutes Lined with Wedge-Shaped Concrete Blocks
Inception Point and Air Concentration in Flows on Stepped Chutes Lined with Wedge-Shaped Concrete Blocks
复制标题
内衬楔形混凝土块的阶梯式溜槽的起始点和空气浓度
DOI：
10.1061/(asce)0733-9429(2008)134:8(1042
复制
发表时间：
2008
影响因子：
2.4
通讯作者：
A. Pinheiro
中科院分区：
文献类型：
--
作者：
A. Relvas;A. Pinheiro
在现有溢洪道泄洪能力不足的情况下，铺有楔形混凝土砌块的阶梯式沟道是一种很有前途的堤防防汛方案。本文研究了这类块体衬砌的阶梯式通道中两相过渡和掠流的特征。设计了两个相对比例尺为1:25 .5的流场实验装置。用光学探针在两个气流的几个横截面上测量空气浓度。分析了规模效应。提出了初始点位置的表达式。考虑到已有的数据和模型，研究了垂直空气浓度分布及其纵向变化。分析了均匀流型的建立。
Stepped channels lined with wedge-shaped concrete blocks are a promising solution to provide overtopping protection for embankment dams if the discharge capacity of existing spillways is not adequate. The paper addresses the characteristics of the two-phase transition and skimming flows in stepped channels lined with this type of block. An experimental setup was developed with two flumes designed with a relative scale of 1:2.5. Air concentration was measured with an optical probe in several cross sections of both flumes. The scale effects are analyzed. An expression for the location of the inception point is proposed. The vertical air concentration profiles and their longitudinal variation are studied, considering data and models proposed by other researchers. The establishment of the uniform flow regime is analyzed.