The paper describes the study of the ignition of wood samples treated with a flame retardant in the presence of different ignition sources (firebrands, pine needle litter) under the laboratory conditions, and to obtain data on fire resistance of wood samples exposed to heat. The charring depth of the wood samples was determined depending on the type of wood, as well as on the type of the fire retardant used. The experimental results show that fire retardants significantly increase the protective properties of wood exposed to firebrands.
The development of devices for localization and extinguishing of wildland fires based on knowledge of the flame structure, including the drying zone, heating, pyrolysis, mixing with oxygen in the air, using relatively small energy disturbances (shock waves), which minimizes the damage caused to the environment have been represented. Using of the considered technical solutions leading to increase the effectiveness and efficiency of activities to combat wildland fires has been shown.
The paper describes the use of IR thermography methods in the investigation of peat fires. The temperature distribution on the peat surface was obtained using a local source of ignition in the form of a glowing spiral located under the sample in the laboratory conditions. These data can be used to determine the horizontal propagation of the peat fire front.
This paper provides the results of the laboratory studies the interaction of smoldering firebrands (pine bark and branches) with fuel bed that is a litter of pine needles. The wind speed and the density of fuel bed were varied during the experiments. The results have shown that the increase in the wind speed leads to the increase in the probability of the fuel bed ignition by firebrands of the same size, and the increase in the density of fuel bed leads to the decrease in the probability of that. The probability of ignition of fuel bed by the branches, all other things being equal, is found to be higher compared to the bark firebrands due to the combustion heat.
The impact of spot fire on wood different-shaped samples (flat and cylindered sample) is studied under laboratory conditions. Using thermal imagery and a thermocouple method, the temperature is determined on the surface of the test samples after the impact of the fire front; the possibility of wood ignition is analyzed for the chosen parameters of the experiment.