Experimental investigation of atomized water droplet initial parameters influence on evaporation intensity in flaming combustion zone

Abstract

Experimental investigation of integral characteristics of typical extinguishing liquid (water) droplet evaporation in flaming combustion zone was carried out with varying of their basic initial parameters (sizes, relative concentration in a flow or current, temperature, screenings content, structure homogeneity, motion velocities into a flow). Optical methods of two-phase and heterogeneous gas–vapor–droplet mixtures diagnostics (“Particle Image Velocimetry” and “Interferometric Particle Imaging”) were employed. The significant influence of temperature, sizes, structure and droplet concentration in the atomized water flow on evaporation characteristics was determined. The sufficiently moderate influence of salt admixtures on water evaporation conditions at its finely divided injection in the flame was established. Some modes of water droplet motion in the flame area were indicated according to their moving velocity and sizes, and combustion product velocities too. Values of water droplet basic parameters were calculated. These parameters provide the maximum evaporation in the flame zone with intended sizes.