NUMERICAL SIMULATION ANALYSIS OF ROAD TUNNEL FIRE UNDER DIFFERENT TYPES OF FIRE GROWTH RATE

摘要

In this paper,we adopt computational fluid dynamics method to simulate road tunnel fires with the help of software FDS. The fire density is set as 20MW and four types of fire growth rate are defined as slow,medium,fast and super fast,respectively. The time-varying feature of fire temperature field along the road tunnel is investigated including longitudinal distribution and cross-section distribution. Furthermore,the smoke layer height,oxygen concentration and velocity in each exhaust port is also studied. By means of processing and analyzing corresponding simulating results,we provide a theoretical basis for crowd evacuation research. Finally,we put on some suggestions on fire control in the tunnel in order to bring about practical significance in disaster prevention and relief of road tunnels.