川藏铁路特殊气象环境对动车组隧道气动阻力的影响

为研究川藏铁路温度与气压条件变化对动车组隧道气动阻力的影响，通过调研川藏铁路雅安至林芝段各站点气象数据，建立了川藏铁路特殊高原气象条件下动车组列车隧道气动阻力的计算模型，分析了川藏铁路沿线气压与温度变化对动车组隧道气动阻力的影响. 研究结果表明:动车组列车的隧道气动阻力与线路环境的气压、温度密切相关；环境气压越低，隧道气动阻力越小，环境温度越低，隧道气动阻力越大；与平原地区的气象环境相比，川藏铁路沿线气压变化对动车组列车隧道运行阻力的影响能达到30%左右，温度变化对动车组隧道运行阻力的影响在10%左右. 

Effect of Sichuan–Tibet Railway Special Meteorological Environment on Tunnel Aerodynamic Drag of Electric Multiple Unit Train

The effects of atmospheric pressure and temperature conditions along the Sichuan–Tibet railway on the tunnel aerodynamic drag of electric multiple unit (EMU) trains were investigated by collecting and analyzing meteorological data of the Ya’an to Linzhi section of the Sichuan–Tibet railway. A numerical model for the prediction of the tunnel aerodynamic drag of EMU trains was established, and the effects of the variations in air pressure and temperature along the Sichuan–Tibet railway were analyzed in numerical simulations. The results show that the atmospheric pressure and temperature affect the tunnel aerodynamic drag of EMU trains. A lower atmospheric pressure leads to lower tunnel aerodynamic drag whereas a higher air temperature leads to higher tunnel aerodynamic drag of the EMU train. Compared with the normal meteorological environment of the plains, the variation in the atmospheric pressure along the Sichuan–Tibet railway causes an approximately 30% change to the tunnel aerodynamic drag of EMU trains, whereas the effect of the variation in air temperature is around 10%.