The study investigates the transition process from a ground fire to a crown fire. The studies were carried out in seminatural conditions on the territory of the Base Experimental Complex (BEC) of the IAO SB RAS. Previously, reconstruction of the forest canopy was carried out. The emergence of a crown fire occurred due to the transition of a ground fire to the bottom layers and further to the crowns of trees. Non-contact diagnostic methods (IR thermography) were predominantly used to measure combustion front parameters.
The article presents the results of a series of mesoscale experiments to study wildfires and their impact on the atmosphere. A change in meteorological parameters, a significant increase in fluctuations of the refractive index, speed of sound and temperature in the vicinity of the experiment, which are a reflection of the occurrence of turbulent processes in the atmosphere, were established, experimental data were obtained on changes in the concentration of methane and carbon dioxide as a result of a fire, and data were obtained on the mechanism of occurrence of crown fire.
The results of numerical simulation using Ansys Fluent software of the droplets trajectories formed during the atomization of water-coal fuel (WCF) using pneumatic mechanical nozzles are presented. The trajectories of two qualitatively different systems are modeled: coal “particle droplets” and water-coal droplets. It is found that the trajectories of moving “particle droplets” and WCF droplets in the vortex chamber have the form of spirals, while the residence time of burning “particle droplets” and WCF droplets in the furnace is proportional to their diameter, which makes it possible to ensure their near-complete burnout.
It was demonstrated that an effective method of reducing the content of sulfur oxides during the combustion of coal-water fuel (CWF) was the method of supplying sulfur-absorbing agents (SAA) to the combustion zone. The optimal temperature conditions required for the effective reduction of sulfur oxides in flue gases using different types of SAA were determined.
The paper presents the effect of low amplitude acoustic pulsations on the temperature field in a flame formed during gasoline combustion. The analysis of the high-temperature inhomogeneities distribution in the flame plume is carried out. It is shown that the effect of acoustic vibrations on the flame plume causes a change in the height of the flame and a change in the rate combustion of the fuel. After analyzing the spectra of temperature changes, the characteristic pulsations are noticed. They differ, depending on the flame zone.
The paper presents experimental investigation results of turbulent vortices scales in diffusion flames. Comparison of obtained data on the basis of digital tracer visualization and thermography was carried out. A good correlation is obtained between the sizes of large vortex structures in the velocity field, recorded using the PIV method, and the size of temperature inhomogeneities, recorded by flame thermography.
The paper presents the experimental study results on the effect of external pressure fluctuations on the temperature field in a flame during the combustion of certain liquid hydrocarbon fuels. It is determined that the height of the flame is changed with an external effect occurrence in the form of small amplitude pressure pulsations. Identified oscillations correspond to the frequency of external sound exposure in the spectrum of flame temperature change.
The numerical simulation results of coal slurry fuel (CWS) combustion in a swirling-type furnace are presented. The velocity and temperature distribution in various sections of the furnace are obtained, as well as the trajectory of the fuel particles movement and its burnout time.
The paper represents the experimental study of the dimensions of turbulent vortices in diffusion flames. The data obtained by the particle image velocimetry method are compared to the data obtained by the thermography method.
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