Effect of Plateau Railway Special Meteorological Environment on Tunnel Aerodynamic Drag of Electric Multiple Unit Train
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摘要:
为研究高原铁路温度与气压条件变化对动车组隧道气动阻力的影响，通过调研某高原铁路雅安至林芝段各站点气象数据，建立了高原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，分析了高原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，高原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.
Abstract:The effects of atmospheric pressure and temperature conditions along a plateau 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 a plateau 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 a plateau 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 a plateau 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%.
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Key words:
- Plateau railway /
- EMU train /
- tunnel /
- aerodynamic drag /
- meteorological environment
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图 1 高原铁路沿线各站点温度与气压条件
Figure 1. Temperature and air pressure condition along the plateau railway
图 6 不同条件下列车隧道运行阻力
Figure 6. Running resistance of train in the tunnel under different conditions
表 1 不同列车速度下气动阻力所占比例
Table 1. The ratio of air resistance at different speeds
速度/（km•h−1） 20 50 100 160 ≥300 气动阻力占比/% 2 15 41 55 75 ～ 95 
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表 2 隧道运行阻力变化量
Table 2. The variation of tunnel running resistance
截面面积/m2 气压/Pa 温度/℃ 隧道运行阻力变化量/% 120 km/h 160 km/h 200 km/h 81 60 795 −30 −17.9 −17.7 −20.2 10 −23.9 −25.9 −27.6 30 −27.1 −31.4 −31.7 70 −31.4 −32.2 −36.6 101 325 −30 10.3 13.9 11.2 30 −5.0 −8.4 −7.9 70 −10.0 −12.7 −13.7 52 60 795 −30 −22.4 −20.4 −20.6 10 −28.4 −27.2 −28.6 30 −32.2 −31.8 −33.4 70 −35.2 −35.9 −37.2 101 325 −30 3.8 9.8 10.9 30 −2.0 −6.4 −7.0 70 −8.3 −13.3 −13.1
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