Russian Federation
Based on experimental data on the analysis of the distribution of particles in a non-stationary gas-powder flow by fractional composition, maps of the particle size distribution in the cloud were obtained. The analogy method is used to substantiate the similarity of the configuration of powder particles in the cloud layer with the mesh. The thermophysical characteristics of the powder layer and mesh were determined; the calculation showed that the power of heat removal by the front of the powder cloud corresponds to the power of heat removal by a metal mesh with a cell size of 1 mm. It has been experimentally confirmed that the contact time of a grid with a mesh size of 1 mm or less with the flame front does not affect the extinguishing effect; therefore, the priority mechanism for stopping combustion of powder is cooling the combustion zone in narrow channels.
fractional composition, fire extinguishing powder composition, heat absorption power, powder extinguishing effect
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