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基于CFD流体动力学分析软件对立交隧道分岔部通风特点展开数值模拟研究,分析了“卜”形和“Y”形两种分岔部支洞在5种不同交角和7种不同风压工况下的气流场变化规律。模拟分析结果表明,角度对分岔部风速和风量的影响效果随分岔部类型不同有所差异,“卜”形分岔部交角达到30°以上时隧道内回流、涡旋等对通风不利的气流现象明显;对比发现“Y”形分岔部在各工况下的通风情况较“卜”形相对良好,受交角的影响也较小;风压对两种分岔部通风的影响趋势则相对一致。
Based on the CFD software, the numerical simulation of the ventilation characteristics of the bifurcation tunnels in the interchange tunnel was carried out. The results showed that the branch bifurcation of the “B” and “Y” Variation of airflow field under different wind pressure conditions. The simulation results show that the effect of the angle on the wind speed and air volume of the bifurcation varies with the type of the bifurcation. When the angle of intersection of the bifurcation reaches more than 30 °, the backflow and vortex in the tunnel adversely affect the ventilation Compared with that of the “Y” -shaped bifurcation at each working condition. The ventilation condition of the “Y” -shaped bifurcation is relatively better than that of the “Bu” The trend of ventilation is relatively consistent.