提高大风条件下动车组运行安全性的防风设施过渡段优化研究

Optimal Study on Windproof Facilities Transition Section for Improving EMUs' Operational Safety in Strong Wind Conditions

作为穿越大风区的高速铁路,兰新高铁的行车安全受大风环境的影响较为严重。对兰新高铁进行大风环境实车试验后,发现列车在某些位置出现明显晃车现象。结合实地考察和现场实车试验,基于三维、定常、不可压雷诺平均SSTk-ω两方程湍流模型来模拟其中一处典型地段的流场特性,得出线路上方最大速度突变点,并采用局部挡风墙改造和铲土方的方法对原始突变流场进行了优化。结果发现:通过局部挡风墙和地形地貌的优化改造,可以明显改善原始流场的突变。90°风向角作用下,1号过渡段、1号山梁、2号山梁和2号过渡段处,2线上方3 m高度处横向速度峰峰值分别为优化前的56.3%、24.4%、55.8%和67.2%,防风效果改善明显。

The safety of Lanzhou—Urumqi high-speed railway line,a high-speed railway through the strong wind area,affected with the strong wind environment seriously.Obvious shaking was found at some locations along the railway line during the full-scale test.Based on the field investigation and full-scale test,the three-dimensional,constant,incompressible and Reynolds average SST k-ω double equations were employed to simulate the flow field of one of the typical sections.The maximum velocity mutation points above the line were found and the original flow field was optimized by reconstruction of the local windbreak and shovelling method.It was found that the optimization results were satisfactory.In the case of 90° wind angle,at 3 m position above the 2# rail,the peak-to-peak lateral velocities of 1# transition,1# ridge,2# ridge,and 2# transition were 56.3%,24.4%,55.8% and 67.2% relative to that of original scheme,respectively.