抄録
Recently, road tunnels in urban areas tend to be complicated. In such tunnels, various studies for securing visibility in environment is necessary for safe escape with regard to the ventilation system. These studies need to develop ventilation control simulators to examine the control of longitudinal air velocity. The simulator we have worked out consists of the solver of a set of ordinary differential equations with regard to the airflow velocities. In order to cope with the complexity of the tunnel topology, the graph theory is introduced, where tunnels are considered a model with links and nodes. We examined the air flow velocity by solving the differential equations. Simulations were carried out to clarify the behavior of longitudinal airflow at a fire under various operations of ventilators, including imbalance operations and so on. This study has enabled us to manipulate the airflow velocity properly for securing a safe evacuation environment. And, we report, a result applied to the Shinjuku Tunnel with the simulator we have built.
