强横风下青藏线列车的两点气动特性

Two aerodynamic characteristics of the Qinghai-Tibet Railway train under strong cross-wind

为进一步探讨侧风对列车倾覆稳定性的影响,以青藏线为背景,当合成风速度一定时,对路堤及桥梁上运行列车的表面压力进行数值模拟并对照相关风洞试验,分析横向压差受路堤高度、桥梁高度及侧偏角的影响特性。结果表明:堤高由0 m(平地)增加到30 m,横向压差最大值所对应的侧偏角由90°降至约45;°桥高由10 m增到60 m,横向压差先递增后递减,最大值点在约40 m桥高处。

Further study of the effect of cross-wind on the overturning stability of train is very important,the numerical simulation of surface pressure of Qinghai-Tibet Railway vehicle running condition on embankment or bridge was performed.The simulation result was compared with relevant tunnel test,and the influence of embankment height,bridge height and sideslip angle on transverse pressure different was analyzed.The result shows that the sideslip angle corresponding to the peak value node of train transverse pressure difference decreased from 90 degrees to 45 degrees when embankment heignt increasing from 0 meter to 30 meters;40 meters is the peak value node of train transverse pressure difference when bridge height changing form 10 meters to 60 meters.