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<p>To research the matching relationship between the aerodynamic load and the tunnel clearance area of the 400+ km/h high-speed train (HST) passing through the tunnel, and improve riding comfort. This study, based on the model ejection test and numerical simulation, the non-monotonic variation of the aerodynamic load of an 8-car unit HST of 400+ km/h under different clearance areas for double-track tunnel (DTT) meeting conditions are analyzed, and recommendations are made for the tunnel clearance area in conjunction with the dynamic tightness index and pressure comfort standard. The results indicate that, the maximum average pressure peak-to-peak value inside the train of HST with different speeds occurs in the seventh car, which requires higher sealing than other carriages. Based on the most unfavorable tunnel length, 400 km/h, 450 km/h, and 500 km/h speed class under the HST recommended to use the DTT clearance area of 100, 105 and 115 m<sup>2</sup>, respectively.</p>

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Vehicle-tunnel coupled aerodynamic load and clearance area analysis based on different speeds

  • 期刊论文

  • 发表日期：

    2025年8月4日

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  • Liming Du,
  • Yichao Sun,
  • Shunde Kang,
  • Xiaojie Zhang

摘要

To research the matching relationship between the aerodynamic load and the tunnel clearance area of the 400+ km/h high-speed train (HST) passing through the tunnel, and improve riding comfort. This study, based on the model ejection test and numerical simulation, the non-monotonic variation of the aerodynamic load of an 8-car unit HST of 400+ km/h under different clearance areas for double-track tunnel (DTT) meeting conditions are analyzed, and recommendations are made for the tunnel clearance area in conjunction with the dynamic tightness index and pressure comfort standard. The results indicate that, the maximum average pressure peak-to-peak value inside the train of HST with different speeds occurs in the seventh car, which requires higher sealing than other carriages. Based on the most unfavorable tunnel length, 400 km/h, 450 km/h, and 500 km/h speed class under the HST recommended to use the DTT clearance area of 100, 105 and 115 m2, respectively.