| In this thesis, QinLing ZhongNanShan tunnel is used as study object, the tunnel natural ventilation is calculated and simulated in order to prove the natural ventilation’s feasibility.In the tunnel ventilation system, a hypothesis is maked, the fluid have incompressibility, reliability, continuity, law of conservation of energy, at the same time, based on the tunnel ventilation calculation formula and combined the actual traffic conditions, the fresh air required to tunnel can be worked out at the present stage; secondly the influence factors of natural ventilation is analyzed such as humidity, pressure and temperature, and the tunnel ventilation calculation formulas under each factors is gived, according to the real tunnel conditions establishes three-dimensional model, the laws for natural ventilation can be analyzed in having shaft and without shaft tunnels, in addition comparative studying the ventilation effectiveness.Based on QinLing ZhongNanShan tunnel and combined the tunnel ventilation calculation formula, two plans about tunnel natural ventilation is simulated:having shaft and without shaft tunnel natural ventilation. Through the wind speed, air quality and energy consumption in tunnel, the two tunnel natural ventilation plans are comprehensive assessmented in order to verify the feasibility study. |
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