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A platform for research: civil engineering, architecture and urbanism
Effect of localized high temperature on the aerodynamic performance of a high-speed train passing through a tunnel
https://orcid.org/0000-0003-0137-7881
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.
Highlights Study the influence of the local high temperature difference by a moving model test. Obtain the aerodynamic performance of trains passing through the tunnel under heat. Compare the pressure curve difference between normal temperature and heating. Analyze the difference of the pressure change and pressure propagation characteristic. Study the pressure peak-to-peak difference under normal and heating.
Effect of localized high temperature on the aerodynamic performance of a high-speed train passing through a tunnel
https://orcid.org/0000-0003-0137-7881
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.
Highlights Study the influence of the local high temperature difference by a moving model test. Obtain the aerodynamic performance of trains passing through the tunnel under heat. Compare the pressure curve difference between normal temperature and heating. Analyze the difference of the pressure change and pressure propagation characteristic. Study the pressure peak-to-peak difference under normal and heating.
Effect of localized high temperature on the aerodynamic performance of a high-speed train passing through a tunnel
https://orcid.org/0000-0003-0137-7881
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.
Highlights Study the influence of the local high temperature difference by a moving model test. Obtain the aerodynamic performance of trains passing through the tunnel under heat. Compare the pressure curve difference between normal temperature and heating. Analyze the difference of the pressure change and pressure propagation characteristic. Study the pressure peak-to-peak difference under normal and heating.
Effect of localized high temperature on the aerodynamic performance of a high-speed train passing through a tunnel
Wang, Junyan (author) / Wang, Tiantian (author) / Yang, Mingzhi (author) / Qian, Bosen (author) / Wang, Kaiwen (author)
2020-11-10
Article (Journal)
Electronic Resource
English
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