ABSTRACT

The flow patterns in a street are investigated in the case of flow exchanges with the sewer. The experimental facility includes one street and one circular pipe located below eventually connected by one or two drains. Compared to the runs without drain or with drainage, overflow creates a strong (up to 50%) increase of the streamwise velocity in the street, particularly, near the bottom, and a high degree of turbulence close to the drains and downstream. For overflow from one drain, the rearrangement of the flow is marked by an asymmetrical pattern with a main secondary current moving across the street; this latter pattern disappears when two drains are present. In field conditions, such an increase is likely to permit entrainment of people and cars by the flow. The experimental data sets could help to validate detailed CFD models aiming at extending the latter results in various flooding conditions.

摘要

在与下水道进行流量交换的情况下，研究了街道中的流动模式。实验设施包括一条街道和一条位于下方的圆形管道，最终由一两个排水管连接。与没有排水管或有排水管的运行相比，溢流使街道中的流向速度显着增加（高达 50%），特别是在底部附近，以及靠近排水管和下游的高度湍流。对于一个排水管的溢流，水流的重新排列以不对称模式为标志，主次级电流穿过街道；当存在两个排水管时，后一种模式就会消失。在野外条件下，这种增加可能会导致人员和汽车被水流夹带。