Resistance to ignition of wood building structures under the thermal influence of flow of burning particles

The interaction of flow of burning and smoldering particles with some types of combustible building materials and wood-based structures was studied experimentally. The heat flux generated by glowing particles was determined, and the temperature fields of the most heat-stressed sections of the structures were analyzed. The sample heating rate was estimated based on the data of IR thermography. For the selected parameters of the experiment, the sample simulating a terrace was found to be the most resistant to ignition. Estimation of the temperature in the near-surface layer of the terrace element showed that after 15 min of continuous exposure to burning and smoldering particles, the temperature in the zone of maximum accumulation of particles did not exceed 130$^\circ$C. A wooden guard model was found to the most prone to ignition (its ignition delay time was more than 15% lower than that of the other structures).