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  Study on the Piston Wind in the Tunnel Generated by a Train with Fire Speeding to a Rescue Station

  A 3-D dynamic mesh model of a train with fire speeding to a rescue station was built in FLUENT software of CFD series. This paper has researched the change of the piston wind on cross sections in different positions of the tunnel and rescue station when a train runs and stops in the rescue station with different states (uniform motion, decelerated motion and stationary state). The results show, when the train enters the tunnel, the piston wind in annular space outside the train has the opposite direction with the train; then it has the same direction as the train, and the smoke flows from the head to the rear of the train because the train runs faster than the piston flows. When the train stops in the middle of the rescue station, the piston wind in both ends of rescue station and annular space flows from the head to the rear of the train, and the velocity decelerates to 1.29 m/s after 6 minutes. When the train stops exactly in the rescue station, the smoke flows to transverse alleyways.

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