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Volume 30 Issue 4
Jul.  2017
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Journal of Southwest Jiaotong University  > 2017  >  30(4): 746-754.
LUO Jianjun. Tunnel Entrance Field Characteristics Induced by High Speed Train with Crosswind at Entrance[J]. Journal of Southwest Jiaotong University, 2017, 30(4): 746-754. doi: 10.3969/j.issn.0258-2724.2017.04.013
Citation: LUO Jianjun. Tunnel Entrance Field Characteristics Induced by High Speed Train with Crosswind at Entrance[J]. Journal of Southwest Jiaotong University, 2017, 30(4): 746-754. doi: 10.3969/j.issn.0258-2724.2017.04.013
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Tunnel Entrance Field Characteristics Induced by High Speed Train with Crosswind at Entrance

doi: 10.3969/j.issn.0258-2724.2017.04.013
  • Received Date: 06 Dec 2015
  • Publish Date: 25 Aug 2017
    Abstract
  • In order to ensure the safety of high speed trains under the existing geographical landscape, a numerical simulation was performed to study the aerodynamic effects of crosswinds at the tunnel entrances. The results of the model show that a crosswind at the tunnel entrance creates a negative pressure peak at the measuring point in the tunnel, and that the pressure increases to a positive peak when there is no crosswind. As the crosswind decreases, the simulated compression wave propagates forward and gradually form two peaks. As the wind speeds progressively decrease, the first compression wave peak gradually disappears and the second peak strengthens to the values above the positive pressure peak when no crosswind is present. Further evaluation of the simulated results showed the piston wind is smaller on the upwind side of the annular space than the leeward side when a crosswind is present at the tunnel entrance. It creates a significant eddy current on the leeward side of the entrance to the tunnel. When the crosswind velocity reaches 40 m/s, the piston wind can reach the velocities of 21.8 m/s. When the crosswind velocity is high, the compression wave at the measured point displays a smaller maximum value and the maximum negative pressure value increases. The maximum negative pressure value and crosswind velocity are proportional to the overall pressure, but the increases in amplitude of the maximum negative peak are greater than the maximum positive pressure increase. When the crosswind velocity reaches 40 m/s, the compression wave in the tunnel can reach a maximum negative pressure value of -6 547 Pa.

     

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