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A numerical study on the ventilation characteristics of rainfall in road tunnel

강우변화를 고려한 도로터널의 환기특성에 관한 수치해석

  • Received : 2015.04.30
  • Accepted : 2015.05.11
  • Published : 2015.05.31

Abstract

When rainfall occurred on road tunnel, that is likely to have influence upon ventilation force in the tunnels but the tunnels ventilation system did not consider factors of rainfall. Thus, this study investigated effects of rainfall upon ventilation force in the tunnels at no rainfall and changing of rainfall by 3 dimensional numerical method. Flow rate into road tunnels decreased as many as 52.34% at rainfall of 150 mm/hr, and pressure drop of road tunnel between entrance and exit decreased as many as 22.22%, so that rainfall had influence upon ventilation force in the tunnel. The number of necessary jet fan in road tunnels is 12 at no rainfall but, when rainfall of 80 mm/hr on road tunnels, the number of necessary jet fan in road tunnels is 16, when rainfall of 150 mm/hr on road tunnels, the number of necessary jet fan in road tunnels is 17. So, factor of rainfall should be considered at estimation of ventilation system of road tunnel.

Keywords

Road tunnel;Rainfall;Ventilation force;Ventilation system;Jet fan

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Acknowledgement

Supported by : 강원대학교