Simultaneous measurement of turbulent velocity field and surface wave amplitude in the initial stage of an open-channel flow by PIV
Simultaneous measurement of turbulent velocity field and surface wave amplitude in the initial stage of an open-channel flow by PIV
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DOI：
10.1007/s00348-005-0995-3
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发表时间：
2005-08
影响因子：
2.4
通讯作者：
Feng-chen Li;Y. Kawaguchi;T. Segawa;K. Suga
中科院分区：
文献类型：
--
作者：
Feng-chen Li;Y. Kawaguchi;T. Segawa;K. Suga
利用粒子图像测速技术（PIV）测量了明渠水流初始阶段流向壁面法向湍流速度场的两个分量，并从PIV图像中识别出自由液面高度。通过显示瞬时速度场、自由表面形状、速度场统计和波浪-湍流相互作用项，描述和演示了该技术的细节。试验结果表明，在明渠水流初始阶段，随着下游距离的增加，近底壁处的流向速度脉动（u′）的湍流强度逐渐减小，而壁面法向速度脉动（v′）的湍流强度逐渐增大;（gis自由表面水平的波动）具有负值，在自由表面附近具有正值，面波影响深度随下游距离的增加而加深。
Particle image velocimetry (PIV) was employed to measure the two components of the turbulent velocity field in the initial stage of an open-channel flow in a streamwise-wall-normal plane, and the free-surface level was discriminated from the PIV image. The details of this technique was described and demonstrated by showing the instantaneous velocity field together with the free-surface shape, statistics of velocity field, and the wave-turbulence interaction terms. Preliminary experimental results showed that the turbulence intensity of the streamwise velocity fluctuations (u′) decreased, whereas that of the wall-normal velocity (v′) increased near the bottom wall with downstream distance in the initial stage of an open-channel flow;(gis the fluctuation of free-surface level) had a negative value,had a positive value near the free surface, and the surface-wave-affected depth deepened with downstream distance.