侧风环境高速公路隧道口防风栅优化设计

Research on Wind Tunnel of Tunnel Portal Based on Strong Crosswind Environment

高速公路隧道口侧风路段流场变化显著易发生交通事故,研究强侧风环境下隧道口路堤与防风栅共同作用对高速公路车辆行车安全的影响。采用SSTk-omega两方程湍流模型和有限体积法,对某一隧道口的防风栅在侧风环境下的流场分布进行了数值计算,分析了不同孔隙率下的防风栅对流场的影响,以及多种侧风环境下防风栅的适用性。结果表明:开孔防风栅可以增加侧风环境车辆的行驶安全性,25%孔隙率的防风栅在多种强侧风环境下均能保证车辆的稳定行驶,对高速公路隧道口防风栅设计提供一定参考。

The change of flow field in the side wind section of expressway tunnel is obviously prone to traffic accidents. This paper studies the influence of joint action of embankment and windbreak in tunnel under strong side wind on highway safety. The SST k-omega two-equation turbulence model and the finite volume method were used to numerically calculate the flow field distribution of the windbreak in the tunnel of Beijing-Tibet Highway in the crosswind environment,and the flow field of the windbreak under different porosity was analyzed. The impact,as well as a variety of cross wind environment,the applicability of the wind barrier. The results show that the open-hole wind-proof grid can increase the safety of the vehicles in the crosswind environment,and the 25%-pore wind-proof grid can ensure the stable running of the vehicle in various strong side wind environments. This paper presents the design of the wind tunnel of highway tunnels. Provide some reference.