Experimental Research And Numerical Simulation Of The Wood Combustion Plume

Fire is a kind of serious hazard burning phenomenon which is out of control in the dimension of time or space. The fire is sudden, changeable, but also has a certain degree of similarity. Study on the law of fire occurrence and development, as well as prediction fire risk is the key to prevent and extinguish the fire. As the basic form of the initial fire, the fire plume is the focus of concern and research.Currently, research on log pile fire has been carried out. But the research mostly concentrated in the experiment and numerical simulation of log pile burning temperature field, there is no in-depth study for wood burning fire plume. This paper carried experimental study and numerical simulation on log fire plume to realize more deeper combustion feather about log fire, and to get some basic rules as well as provide important theory basis to control the fire timely. The main research content of this paper are as follows:(1)In the aspect of theoretical analysis, combined with the FDS numerical simulation software, the paper set forth the mathematical and physical model and solving strategy applicated for log fire research based on LES method which including the basic equations, the combustion model, radiation model, and the model of carbonization.(2)In the aspect of experimental study, combustion experiments were carried out under no wind and 2m/s wind speed. The burning spread, flame height and flame temperature of the plume, as well as the pilot fuel heat realize rate were determined, which will provide data basis and boundary conditions for the further numerical simulation.(3) In the aspect of numerical simulation, simulation model was established according to the experiments with appropriate parameters. And the simulation results of the plume temperature at the central axis were compared with the experimental results to check the feasibility of the model. Then entrainment velocity and mass flow rate were calculated. In the end, the paper analyzed the change trend of entrainment velocity and mass flow rate under different wind speeds.