Aerodynamic effect of cross passages at the entrance section of a high-speed railway tunnel in a region with mountains and canyons

• Published in: Journal of wind engineering and industrial aerodynamics Vol. 204; p. 104268
• Main Authors: Luo, Jianjun, Li, Zerui, Wang, Lei, Zhang, Dapeng, Wu, Yongfu
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2020
• Subjects: Compression wave; Cross passage; High-speed rail tunnel; Micro-pressure wave; Compression wave; Micro-pressure wave; High-speed rail tunnel; Cross passage
• ISSN: 0167-6105; 1872-8197
• DOI: 10.1016/j.jweia.2020.104268

The environmental characteristics of difficult mountainous regions has ruled out the easy installation of buffer structures in tunnels. To address this problem, we proposed the installation of cross passages in an entrance section to alleviate the aerodynamic effects of a high-speed train entering the tunnel. In this study, a slide rail high-speed train experimental aerodynamic model was established based on the same principles. By combining the aerodynamic model experiments with a numerical simulation, the effect of cross passage on the generation and propagation of compression waves and micro-pressure waves was investigated. The simulation was capable of predicting the behavior of compression waves and verifying the correctness of the model at a low cost. The results showed that the installation of cross passages could reduce the peak pressure of the initial compression wave, modulate the pressure fluctuation in the tunnel and reduce the micro-pressure wave. For a train speed of 350 ​km/h and a tunnel cross-sectional area of 100 ​m2, the cross passage with the best modulation effect had a length of 10 ​m and a cross-sectional area of 20 ​m2. This cross passage was located at a distance of 10–20 ​m from the tunnel opening. •Proposed a cross passage method to mitigate aerodynamic effects.•An aerodynamic model with good prediction and low cost was built and verified.•Through numerous numerical simulations, optimized the cross passage arrangement.