The ventilation system of Hsuehshan Tunnel is a unique design. The tunnel will be the major means of connection between the populated Taipei Area and the East Coast of Taiwan with beautiful landscape. The traffic load on the tunnel will be heavy, especially during weekends. Therefore its ventilation capability and related emergency measures have to be reliable. The three-dimensional flows in a section of the air exchange station of the tunnel were computed and analyzed. The loss coefficients were calculated and summarized into correlations, which will be essential building blocks for setting up the one-dimensional model of the whole system. This simplified model is going to be further developed for investigating the ventilation capability of the Tunnel.
