Abstract
The experimental investigations of gas-vapor-droplet two-phase flow formation during single water droplets and their aggregate motion through high-temperature (more than 1000K) combustion products have been conducted with usage of cross- correlation measuring facility and optical methods of tracer visualization (Particle Image Velocimetry and Interferometric Particle Imaging). Modes of droplet motion in high-temperature gases area have been established. It has been determined the influence of the main droplet (sizes, composition, temperature, dispersability, form, velocity) and gas (temperature and velocity) characteristics on parameters of forming gas-vapor-droplet mixtures. The main elements of advanced firefighting technologies with the usage of time and space apportioned polydisperse composition water droplet flows have been formulated. Physical and predictive mathematical models have been developed to determine the basic parameters of equipment which is necessary for operation with these technology usage.
Highlights
The idea of using in fire-fighting of the dispersed phlegmtizators of burning, especially water mist, received recently quite extensive discussion
The experimental investigations of gas-vapor-droplet two-phase flow formation during single water droplets and their aggregate motion through high-temperature combustion products have been conducted with usage of crosscorrelation measuring facility and optical methods of “tracer” visualization (“Particle Image Velocimetry” and “Interferometric Particle Imaging”)
Physical and predictive mathematical models have been developed to determine the basic parameters of equipment which is necessary for operation with these technology usage
Summary
The idea of using in fire-fighting of the dispersed phlegmtizators of burning, especially water mist, received recently quite extensive discussion. One of the major aspects increasing the efficiency of water mist using in firefighting, is the intensification of the process of its evaporation in the field of a flame. Research of the process of water mist evaporation in the flame field with the use of modern diagnostic methods, and influence of water parameters (component structure, initial temperature, rate, the sizes of droplets in a flow) on the characteristics of this process is of special interest. The purpose of this work – experimental research of the process of two-phase gas-vapor-droplet flows formation at movement of water droplets in the field of high-temperature combustion products, and the ranges establishment of influences of the water mist initial parameters on this process
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