Research On Method Of Fire Simulation In Long-narrow Confined Space Based On CFAST

Constrained fire accident will cause casualties and property losses. Whether mine roadway or tunnel, they have a common identity on geometric structure. Both ratio of length/width and the ratio of length/height are big, and both of them are limited by space. This requires us to do much research on this long-narrow confined space fire,.In this paper, consolidated model of fire growth and smoke transport-CFAST was used to stimulate the long -narrow confined space fire. After made an in-depth analysis to CFAST, Predecessors'experimental model and experimental data was inspected, and then use CFAST model as close as possible to set up an experimental model of the logic of their model, to validate the effectiveness of the CFAST model of simulating the long-narrow confined space fire. Through the rational division of the number of sub-regional, replacing non-rectangular cross-section to rectangular cross-section with area equivalent principle, and choosing reasonable analog data can stimulate the long -narrow confined space fire and get rational results.Finally, CFAST model was used to stimulating fire in Dongshan tunnel with different wind speed and different fire power. After simplify the model of tunnel, the flow of smoke layer and the temperature field was simulated with different conditions. Through the study found that the spread and temperature changes of smoke layer are more reasonable in case of no wind, but smoke flow when there is wind in the circumstances. The results of this article can provide a method of simulating fire in long-narrow confined space, and provide a theoretical basis for tunnel fire safety design and fire rescue work.