河道中弯道水流对穿越管道的作用

Effects of bend-flow through river channel on river-crossing pipeline

基于几种典型河弯断面,对因河势演变和弯道水流而对裸露于弯道水流中的穿河管道产生的纵向和横向水流冲刷,纵向绕流产生的升力和压差阻力及横向环流间诱导速度产生的动量和动量矩等作用进行了研究。因这些作用是沿穿河管道纵向和横向连续变化的,故在进行类似的工程设计和施工时,应通过水工模型试验或数值模拟计算,对其进行研究,以确保穿河管道的安全。

Based on several typical sections of river bends, the effects from both the evolution of river regime and the bend-flow on river-crossing pipeline, such as the erosions from longitudinal and transverse flows, the uplift and pressure drag caused by the flow around pipe and the momentum and angular momentum caused by the induced velocity between transverse circle flows, etc. , are studied herein. As all the effects are longitudinally and transversely changed along the river-crossing pipeline continuously, the relevant studies must be made on them with hydraulic model test or numerical simulation during the design and construction of the similar project, so as to ensure the safety of the river-crossing pipeline concerned.