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首页> 外文期刊>International Journal of Civil Engineering,Transaction A:Civil Engineering >Particle Image Velocimetry Measurements of Flow Over an Ogee-Type Weir in a Hydraulic Flume
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Particle Image Velocimetry Measurements of Flow Over an Ogee-Type Weir in a Hydraulic Flume

机译：液压小管中ogee型堰流量的粒子图像速度测量

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摘要

Laboratory tests of water flowing over a modified ogee weir are carried out in a wave-current flume for two different scales. A model of a weir representing a part of a spillway section of the existing Wloclawek dam (Vistula River, Poland) is mounted in a wave-current flume. The Froude similarity law is used to simulate the flow over a real damming structure at 1:25 and 1:50 scales. Particle image velocimetry methods are employed to measure a flow velocity field over the crest of the weir model. The system is capable of providing high fidelity velocity fields at sampling rates of 10 Hz and 50 Hz. Detailed information on flow characteristics is extracted from the instantaneous velocity field measurements to provide a comprehensive description of the kinematics of a weir flow at discharges corresponding to hydrological events with return periods of 100 and 1000 years, revealing some interesting spatial features. The geometry of the weir results in the development of a characteristic circulation cell, which is relatively wide for the lower discharge. When the flow intensity increases, a triangular circulation develops behind the weir crest instead. Moreover, sudden changes in the flow regime lead to the rapid formation of vortex structures, which propagate downstream at speeds ranging from 0.3 to 1 m s(-1). The origin of eddy formation is identified at the upstream and downstream ends of the weir crest for respective average velocities at the crest of approx. 0.6 m s(-1)and 1.2 m s(-1).
机译：流过修改的ogee堰的水的实验室测试在一个不同尺度的波浪冲击器中进行。代表现有Wloclawek Dam（Vistula River，Poland）的溢洪道部分的一部分的堰模型安装在波浪电流水槽中。 FRoude相似度法用于在1:25和1:50秤上模拟真正的禁止结构上的流量。粒子图像测速方法用于测量堰模型的波峰上的流速场。该系统能够以10Hz和50Hz的采样速率提供高保真速度场。从瞬时速度场测量中提取有关流动特性的详细信息，以提供对应于与返回期为100和1000年的水文事件的排出的堰流量的全面描述，揭示了一些有趣的空间特征。堰的几何形状导致开发特征循环电池，其相对较宽，用于较低的放电。当流动强度增加时，三角形循环在堰顶部后面发展。此外，流动制度的突然变化导致涡旋结构的快速形成，其在0.3至1M S（-1）的速度下传播下游。涡旋形成的起源在堰嵴的上游和下游端识别，用于大约的峰值的各自的平均速度。 0.6 m s（-1）和1.2 m s（-1）。

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