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Journal of Zhejiang University SCIENCE A
ISSN 1673-565X(Print), 1862-1775(Online), Monthly
2024 Vol.25 No.11 P.953-969
Effects of high geotemperature and high altitude on the pressure wave of high-speed trains running in a long tunnel
Abstract: Considering the high-temperature distribution along a tunnel in a high-altitude area, the effects of high geotemperature and high altitude on the pressure wave of trains running in long tunnels were investigated using a 3D, compressible, unsteady turbulence model. To reduce the simulation cost and reflect the pressure wave characteristics in long tunnels, a representative tunnel length was first determined for simulation. The simulation results indicated that compared to the condition of a normal ambient-temperature tunnel, when trains go through a high geotemperature tunnel, the distribution of the minimum pressure (Pmin) along the tunnel moves to the tunnel entrance. The pressure amplitudes on the tunnel and train decrease integrally, with maximum reductions of 7.9% in the maximum pressure (Pmax) and 44% in Pmin on the tunnel, and 4.6% in Pmax and 12% in Pmin on the train. When trains meet in high geotemperature tunnels, the distributions of Pmax and Pmin along the tunnel change. The pressure amplitudes decrease integrally, with maximum reductions of 13.8% in Pmax and 36.9% in Pmin on the tunnel, and 7.1% in Pmax and 15.6% in Pmin on the train. The pressure difference between the two sides of the train during the intersection decreases by 15.9%. As the altitude rises, when trains cross and meet in tunnels, the waveforms of pressures on the tunnel and train and the pressure difference between the two sides of the train remain unchanged, and the peaks decrease linearly.
Key words: High geotemperature; High altitude; High-speed train; Long tunnel; Pressure wave
机构:西南交通大学,轨道交通运载系统全国重点实验室,中国成都,610031
目的:高速列车隧道运行时产生的空气压力波会对车体及隧道结构的安全造成不良影响,是铁路隧道设计中需要解决的关键科技问题之一。高海拔地区高速铁路隧道具有长度大的显著特点,并且低气压、高地热等特殊线路环境条件将会对隧道内空气的密度、粘度等参数产生影响,从而影响列车隧道运行时产生的空气压力波的特性。研究高地温和高海拔对高速列车长大隧道运行压力波的影响,对于保证隧道高速列车在该地区隧道内运行时车体及隧道的结构安全有重要价值,并可为隧道的设计提供技术支持。
创新点:1.通过分析隧道长度对于高速列车隧道运行压力波特性的影响,确定具有代表性的隧道长度用于仿真模拟,以降低计算成本和有效反映高速列车长大隧道运行压力波特性。2.建立的计算空气动力学仿真模型中考虑了高温沿整个隧道的分布情况,可模拟更加真实的高地温环境。
方法:采用三维、非定常、可压缩雷诺时均方程和RNGk-ε湍流模型,研究高地温和高海拔对高速列车隧道通过和隧道交会压力波特性的影响。
结论:1.与正常环境温度的情况相比,当高速列车通过高地温隧道时,隧道和列车表面的压力峰值减小,并且出现得越来越早。2.与正常环境温度的情况相比,当高速列车在高地温隧道中交会时,隧道表面压力最大值沿隧道分布的对称点向隧道入口移动,压力最小值的分布也发生变化。3.随着海拔的上升,列车隧道通过及交会时,隧道和列车表面的压力波形以及列车两侧的压差保持不变,并且峰值线性减小。4.列车在高海拔、高地温的长大隧道中运行时,列车和隧道表面的压力幅值整体减小;然而,温度的变化会影响隧道表面压力幅值出现的位置,在隧道设计和维护时,这些位置可能需要更多的关注以及更准确的定位。
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DOI:
10.1631/jzus.A2300361
CLC number:
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On-line Access:
2024-12-06
Received:
2023-07-11
Revision Accepted:
2023-12-23
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2024-12-06