The Experimental And Computational Study Of The Fraction Of Fire And Smoke In Subway Tunnel

The quickly developed subway transportation needs to be put forward stricter requirement for prohibiting the subway fire, but this subject started very late in our country, we haven't got a matured system to control the smoke in subway tunnel. So we have to deepen the research about fire safety in the subway tunnel to make sure we can have a reliable theoretical reference and technological support in operating the subway.The basic traits of the general fire system are nonlinear character, and the fraction phenomenon is one of these nonlinear characters. Based on the open project of USTC, we approach the typical fraction phenomenon with three ways: theoretical analysis, experiments and numerical simulation.1,We analyzed the plume smoke flow and upstream smoke flow which are two kinds of fraction phenomenon theoretically: Described the mathematic equation of the two kinds of fraction phenomenon and then pointed out the infected factor, then deduced the calculation formula of the critical ventilating velocity.2,Made a reference to the analogical theories, we developed the experimental scheme and testing facilities in the subway model in Beijing University of Technology, then tested the needed data and neatened and analyzed them.3,We used CFD software PHOENICS to calculate the fire and smoke distribution in subway tunnel, then discovered the dangerous fire distance and the fire power presenting a parabola variety in plume smoke flow calculation, also we attested the critical ventilating velocity in smoke upstream flow calculation which we got from the experimental and theoretical study.