风沙区涵洞翼墙类型对风沙流输移影响的数值模拟
涵洞是主要用来排泄路堤下水流的构造物，而风沙地区道路涵洞普遍面临积沙问题，影响行洪并威胁道路安全，而涵洞口翼墙是影响涵洞积沙的重要因素。为了甄选出可减少涵洞积沙的翼墙类型，构建了一字墙（A）、八字墙（B）、直式墙（C）等三种典型翼墙涵洞模型，对涵洞内外流场特征及积沙过程进行数值模拟。结果表明：（1）涵洞内流场结构及流速因翼墙类型而明显变化，A、B洞内气流主要贴附于涵洞上壁面移动，C洞内气流处于加速状态，洞内整体流速C>B>A；（2）涵洞积沙过程因翼墙类型而明显变化，因A、B的导汇流作用，洞内风沙流浓度较高，易发生积沙，C导流能力弱，在涵洞口及路肩容易积沙；随着来流风速增大，三种涵洞的输沙能力均得到提升，C提升最明显，B其次，A最小；（3）风向对涵洞积沙也有影响，随着斜交角度增大，A、C洞内积沙程度加重而B洞内积沙程度减轻。（4）不同翼墙对风沙流的输移效率不同，洞内积沙程度A>B>C，输沙效率则C>B>A。总体来说，翼墙C有利于减轻涵洞积沙。
水工结构治河工程、防洪工程环境科学理论
道路涵洞流场分布风沙流数值模拟
崔珂军,李生宇,张璟,夏天.风沙区涵洞翼墙类型对风沙流输移影响的数值模拟[EB/OL].(2024-12-16)[2025-11-04].https://chinaxiv.org/abs/202412.00188.点此复制
Culvert is a structure mainly used to discharge the water flow under the embankment, and the road culvert generally faces the problem of sand accumulation, which affects the flood flow and threatens the road safety. In order to select the types of wing wall that can reduce the sediment accumulation in culverts, three typical wing wall culvert models, namely, one-sided wall (A), eight-sided wall (B) and straight wall (C), were constructed, and the characteristics of the outflow field and the sediment accumulation process were numerically simulated. The results are as follows: (1) The structure and velocity of the flow field in the culvert vary significantly with the type of wing wall. The air flow in cavities A and B is mainly attached to the upper wall of the culvert, and the air flow in cavity C is accelerated, and the overall velocity in the cave is C>B>A; (2) The process of sediment accumulation in culvert varies significantly with the type of wing wall. Due to the guiding effect of A and B, the concentration of wind-sand flow in the cave is high, and sand accumulation is easy to occur; C, the diversion ability is weak, and sand accumulation is easy to occur at the culvert mouth and shoulder; With the increase of incoming wind speed, the sand transport capacity of the three culverts is improved, C is the most obvious, B is the second, A is the least. (3) The wind direction also has an effect on the sediment accumulation in the culvert. With the increase of the oblique Angle, the sediment accumulation degree in cave A and C is increased, while the sediment accumulation degree in cave B is reduced. (4) The transport efficiency of different wing walls is different, the degree of sand accumulation in the tunnel A>B>C, and the transport efficiency C>B>A. Generally speaking, wing wall C is conducive to reducing the accumulation of sand in the culvert.
road culvertflow field distributionwind-drift sandnumerical simulation
展开英文信息
评论