【摘要】 沙纹的形成会显著地影响床面附近的湍流结构。论文通过水槽实验,模拟了天然河流中沙纹的形成,并针对最终形成的稳定沙纹形态,利用声学Doppler测速仪采集了沙纹床面不同位置处的高频流速过程数据,继而对脉动强度、雷诺应力、湍流动能及自相关函数等湍流特征量进行了计算,并分析了沙纹床面湍流结构和特点,为进一步的理论和数值研究提供了有价值的参考数据和依据。更多还原

【Abstract】 Sand ripple has significant influence on turbulent structure of flow over it,which was testified with measurement and experiment in this paper.The experiment was carried out in a flume to simulate sand ripple formation in an open channel under natural conditions.Under the erosion of water,sand ripple with relatively steady shape was produced and high frequency velocity was sampled at different locations and heights with Acoustic Doppler Velocimeter(ADV),based on which turbulent characteristics are computed and analyzed to offer reference data for further study,including turbulent intensity,Reynolds stress,turbulent kinetic energy and autocorrelation feature.更多还原