论文部分内容阅读
为了研究明渠水流流速的时空相关性,在水槽中进行了3种不同比降的恒定均匀流试验。利用粒子图像测速系统(PIV)对水流的时间序列二维流场进行了测量,根据测量结果,分析了流速的时空相关性及其随比降的变化。结果表明:纵向流速空间相关等值线基本呈椭圆形分布,垂向流速空间相关等值线基本呈圆形分布,两者的时间相关曲线均呈一衰减曲线分布;随着比降的增大,同一数值的等值线包含的空间范围减小,而同一时间间隔对应的时间相关系数减小。
In order to study the spatiotemporal correlation of open channel flow velocity, three uniform and constant flow tests with different specific ratios were carried out in the water tank. The time series two-dimensional flow field of water flow was measured by particle image velocimetry system (PIV). According to the measurement results, the spatio-temporal correlation of flow velocity and its variation with drop ratio were analyzed. The results show that the spatially correlated contour of longitudinal velocity is almost elliptical and the vertical contour of spatially correlated is basically circular. The time-dependent curves of the two have a decay curve. With the increase of the ratio , The same value of the isoline contains the spatial range decreases, while the corresponding time interval corresponding to the time-dependent reduction.