Experimental Study on Flame Extension and Pattern Analysis of Jet Fire Impinging Wood Plates

Jet fires generally leave patterns on the surface of the plate, which can be helpful for fire investigators to find the source and cause of fire incidents. However, the interaction between jet fires and wood plates still lacks research. This paper investigates the flame extension and pattern of jet fire impinging wood plates under strong plume conditions. The flame extension length beneath the plate is intensely studied. Moreover, an attempt is made to relate the fire patterns left by the jet fire impinging on the wood plate with the fire characteristic parameters. The results indicate that the flame extension length under the plates is strongly related to the visible free height, nozzle-plate height, and gas fuel velocity. The radius of the fire pattern is highly correlated with the flame extension length, and a new relationship equation between the radius of the fire pattern and the flame extension length is proposed. The area of the fire pattern is related to three characteristic parameters, the fuel flow rate, nozzle diameter, and nozzle-plate height, and the prediction equation of the fire pattern area is given to collapse all the experimental data well to provide theoretical support for fire investigation work.