【摘要】 采用水槽试验,对连续微弯弯道的水流结构进行研究。通过整理分析枯水和平滩两种典型工况的试验数据,对连续微弯弯道水流的纵向垂线平均流速、水流动力轴线、纵向和横向流速及垂线环流强度分布规律进行研究探讨。研究表明,连续微弯弯道水流具有主流偏向凸岸侧、凹岸近壁处易发生水流分离现象、凹岸侧纵向流速最大点靠近床面、横向环流呈非对称的双环流结构、断面凹岸侧垂线环流强度大于凸岸侧等特点,展现出与一般弯道水流不同的特征。更多还原

【Abstract】 A study was done on the flow structure of a continuous micro-bend channel by the means of flume experiment. With the organization and analysis of experimental data under two typical conditions: low and bankfull discharge,distributions of the longitudinal depth-averaged velocity,flow dynamic axis,longitudinal and lateral velocity,strength of secondary flow along the vertical line were discussed. The research shows that continuous micro-bend channel is characterized by main flow moving to the convex bank,flow separation near the concave bank,the maximum of longitudinal velocity close to the bottom near the outer bank,asymmetric double-circulation structure appearing in the bend,strength of secondary flow in depth on the concave bank larger than the convex bank,which are different from the general bend flow.更多还原