论文部分内容阅读
基于标准κ—ε双方程湍流模型,分析运行在跨峡谷桥梁上的列车外部稳态流场,研究不同峡谷间距、列车在桥上不同位置时峡谷风对列车气动性能的影响规律。计算结果表明:在同样风速条件下,峡谷间距越小,对气流的加速作用越明显,当峡谷间距分别为150,200,250和300m时,桥梁上方的风速分别增加了17.5%,11.6%,7.2%和3.4%;峡谷间距150m时车辆受到的侧向力、升力和倾覆力矩比300m时分别增大约25.7%,84.5%和21.1%;列车处于峡谷中间位置时受到的气动力最小,列车处于刚进入峡谷位置时受到的气动力最大,后者比前者车辆受到的侧向力、升力和倾覆力矩分别增大了5.5%,8.2%和7.8%。
Based on the standard κ-εtwo-equation turbulence model, the steady-state flow field outside the train running across the canyon bridge is analyzed to study the effect of canyon wind on the aerodynamic performance of trains at different gully spacings and at different positions of the bridge. The results show that under the same wind speed, the smaller the gully spacing is, the more obvious the acceleration is. When the gully spacing is 150, 200, 250 and 300 m respectively, the wind speed above the bridge increases by 17.5%, 11.6%, 7.2% and 3.4% %; When the distance between canyons is 150m, the lateral force, lift and overturning moment are increased about 25.7%, 84.5% and 21.1% respectively when the distance is 300m; the aerodynamic force is lowest when the train is in the middle of the gorge. The aerodynamic force was the largest, which was 5.5%, 8.2% and 7.8% more than the lateral force, lift and overturning moment of the former vehicle respectively.