复式交汇河道水流紊动特性分析

Turbulent Characteristics of Water Flow at Junction of Compound Channel

利用室内水槽模型,深入模拟了交汇的复式河道水流的流态。采用三维多普勒三向流速仪对复式交汇河流不同垂线的脉动流速进行了观测,并对下游某一断面的时均流速、紊动强度、雷诺应力等沿垂线的分布规律进行了分析。结果表明:在滩槽交界附近存在一个流速间断面,在这个区域水流所受阻力较大,过汇流口后,水槽内水流流态基本符合明渠流动特性。

Using the interior water channel model, the flow state of the compound channel was simulated. Adopting the three-dimensional Doppler three converge, the vertical line pulsation flow rate of the compound intersection river, and the distributions along the vertical line such as the time-averaged velocity, turbulent intensity, and Reynolds stresses and in one section in the down stream were analysed. The results showed that there was a flow velocity cross-section in beach-slot interface nearby, and the flow resistance was much bigger in this area. After the convergence of mouth, flow pattern was the similar to the open channel flow characteristics in the flume.