论文部分内容阅读
通过水槽试验,应用声速多普勒测速仪(ADV),研究了入汇角为30°时,支流斜接主流交汇区及其附近的三维水流结构,获得了不同主支汇流比下的三维流场及其脉动特性。试验表明:在交汇区三维流场中,产生了回流分离区,其中并伴随环流结构,大大改变了单一明渠中的流速分布及脉动特性。在入汇口下游主流右侧(入汇口一侧)水流脉动强度在z/h=0.2处易出现极大值,其形成机理还有待验证。
Through the experiment of water tank, the velocity structure of the three-dimensional flow in the main intersection and its vicinity of the mainstream was studied by using the velocity-velocity Doppler velocimeter (ADV). The three-dimensional flow with different main branch confluence ratios Field and its ripple characteristics. Experiments show that the three-dimensional flow field in the junction produces backflow separation zone, which along with the circulation structure greatly changes the flow velocity distribution and pulsation characteristics in a single open channel. At the entrance to the mainstream on the right (inlet) side of the flow pulsation intensity at z / h = 0.2 is prone to maximum, the formation mechanism remains to be verified.