Abstract A moving model (1/20 scale) was used to study the effect of high temperature at the entrance of a tunnel on the aerodynamic performance of a high-speed train passing through it. The air in the tunnel was heated using highly-precise, self-controlling, ultra-thin, silicone rubber heating devices that were firmly attached to the inner surface of the tunnel (covering the first 2 ​m of the tunnel from the entrance). When the specified temperature was reached, tests were performed using a model train moving at different speeds. The experimental results were used to compare and analyze the pressure fluctuations and propagation of pressure waves under normal and localized high-temperature conditions. The results show that the peak-to-peak value of the transient pressure on the tunnel surface decreases by 5–7% in the presence of a normal ambient and high temperature tunnel mode. In addition, the corresponding difference on the surface of the head of the train is 3–4%. Hoping this experimental study will encourage theoreticians to investigate the mechanism responsible for the generation of transient pressures in localized high temperature railway tunnels. The results can provide guidance and support for researchers seeking to improve passenger safety and comfort in high temperature railways.

中文翻译：

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局部高温对高速列车通过隧道气动性能的影响

摘要 采用运动模型（1/20比例尺）研究隧道入口高温对高速列车通过隧道空气动力性能的影响。隧道内的空气使用高度精确、自控、超薄的硅橡胶加热装置加热，这些装置牢固地附着在隧道内表面（覆盖隧道入口处的前 2 米）。当达到指定温度时，使用以不同速度移动的模型列车进行测试。实验结果用于比较和分析正常和局部高温条件下压力波动和压力波的传播。结果表明，在正常环境和高温隧道模式存在的情况下，隧道表面瞬态压力的峰峰值降低了5%~7%。此外，列车头部表面的相应差异为3-4%。希望这项实验研究将鼓励理论家研究导致局部高温铁路隧道瞬态压力产生的机制。研究结果可为研究人员寻求提高高温铁路乘客安全和舒适度提供指导和支持。希望这项实验研究将鼓励理论家研究导致局部高温铁路隧道瞬态压力产生的机制。研究结果可为研究人员寻求提高高温铁路乘客安全和舒适度提供指导和支持。希望这项实验研究将鼓励理论家研究导致局部高温铁路隧道瞬态压力产生的机制。研究结果可为研究人员寻求提高高温铁路乘客安全和舒适度提供指导和支持。