单向连续车流下公路隧道紊流分区结构与流场特性

Turbulence partitions and flow distribution of road tunnel under continuous unidirectional traffic

将隧道内流场划分为3个区域,从上到下分别为壁面影响区、车辆影响区及紊流推进区。根据卡门流速分布亏损律,建立了单向连续车流下二维公路隧道紊流方程,引入普朗特掺混长度理论和范德里斯公式,得到了3个区域的二维流速分布公式。以1∶10的缩尺比例搭建了隧道通风实验平台,测试了在4种模型车速下隧道中截面的风速,对比验证了二维流速分布公式的准确性。最后基于二维流速分布公式和实验数据,分析了公路隧道中3个分区的风场特性,并给出了隧道平均活塞风速计算公式珔u≈0.486v0-0.116 7(v0为车辆行驶速率)。

For the airflow inside the road tunnel with three divided regions of wall-affected zone, vehicleaffected zone and turbulence zone, two-dimensional turbulence equations of road tunnel under continuous unidirectional traffic were established, according to Carmen velocity defec law. The two-dimensional velocity distribution formulas of the three regions were obtained after rupulangte mixing length theory and van der Rees formula was cited. Experimental platform for road tunnel ventilation was built using 1/10 scale model tunnel and model vehicles. Velocities of 13 points in the middle section of the tunnel were tested on four model vehicle ones. The accuracy of the two-dimensional velocity distribution formula was verified and compared with the test data. Based on the two-dimensional velocity distribution formula and experimental data, the characteristics of the air flow in road tunnel were analyzed and the average piston wind tunnel formula was presented,it is u ≈0. 486v0-0. 116 7 （v0 is vechicle speed）.