The use of the value of σs for the materials in calculating fire risks allows obtaining more accurate values.Īndrey V. The lack of consideration of the physical model of smoke in assessing visibility under fire conditions and, accordingly, in determining the time of onset of loss of visibility, implemented in engineering calculations of fire risks, may lead to incorrect determination of this parameter.

Determination of the possibility of converting the smoke production factor D m to Y s by solving the analytical equation makes it possible for the subsequent application of the available data array on the smoke-forming capacity of various materials in modeling the process of changing the visibility in smoke. This will improve the accuracy of calculations using the FDS. It is advisable to use the values of σ s for the material individually when calculating Y s. The results can be applied in modeling fires.Ĭonclusions. The best convergence with the experimental data has the values of Y s, determined with an individual for a particular fire load.Īpplication field of research. The performed simulation showed that when calculating the time of loss of visibility in a room during smoke, it depends on the specific extinction coefficient σs, which is used to determine the soot yield Y s in the FDS. Modeling the smoke in the room using the computational fluid dynamics model (CFD).įindings. The article is devoted to comparing the results of visibility measurements in smoke conditions with simulation results in the FDS, as well as the influence of the choice of the specific mass extinction coefficient on the results of modeling the smoke optical properties and the time of the onset of the critical value of visibility loss in fire conditions. Modeling, visibility, smoke-forming ability, smoke yield, experimental studies Abstract

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Materials in pyrosim