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通过多组次水槽试验,应用声速多普勒测速仪研究入汇角为90°时,不同汇流比水流条件下支流入汇区域及其附近的水面比降变化和时均流速分布特征。试验表明,入汇口上游的干支流水面坡降取决于干支流相互顶托影响,而入汇口处及其下游合流掺混区水面坡降随干流流量增大而增大,随汇流比增大而有所减小。不同位置垂线时均流速分布主要受主支汇流比和水流流态的双重影响,随着汇流比的增大,入汇口上游断面时均流速逐渐减小,而入汇口下游断面产生了明显的高、低流速带,形成回流分离区。
The multi-sub-tank experiments were carried out to study the characteristics of water surface velocity changes and time-averaged velocities under different confluent flow conditions with the inflow angle of 90 ° by using sound velocity Doppler velocimetry. The experimental results show that the slope gradient of the dry tributaries upstream of the inlet depends on the mutual influence of the dry tributaries and the top gradient of the confluent mixing zone at the inlet and its downstream increases with the increase of the mainstream flow rate. Large and somewhat reduced. The vertical velocities at different positions are mainly affected by the main branch branch flow ratio and the flow pattern. As the confluence ratio increases, the average flow velocity decreases gradually at the upstream section of the inlet, Obvious high, low flow rate zone, the formation of reflux separation zone.