Today, smoke eliminating equipments which are going to work at a fire are adopted at a lot of subway stations in Japan. But there is some possibility of not working at a fire. So we think that designing a new fire safety system will improve the reliability of fire safety. Solar chimneys and Dry mist equipments which are studied in recent years are installed in our system (named passive safety system). So passive safety system can usually control the movement of air in the subway station as outside → a staircase → a platform (or concourse) → a solar chimney → outside. Smoke will be discharged from a solar chimney and safety of staircases will be kept at a fire. We made experiments based on scaling laws using 1/20 scale model of a subway station to understand the movement of smoke at a fire in a subway station. In addition to the model experiments, we simulated the movement of smoke using CFD software.
