The work presents the results of experimental studies of temperature changes. These changes correspond to the scales of turbulence in the flame during a model crown fire and in the air in the vicinity of the combustion front. The inertial interval of the energy spectrum corresponds to turbulent processes in a flame. There is a relationship between the internal turbulence scales in the flame of a fire front and the internal turbulence scales induced by the combustion source. Induced atmospheric turbulence has a range of wave numbers associated with dissipative processes.
The processes of combustion and flame propagation in various technological devices and during wildfires are carried out, specifically, under turbulence conditions. Turbulent combustion is a non-stationary process of turbulent mixing of combustion products with a fresh mixture and its ignition due to the temperature increase. This article compares estimates of the turbulence scale in a flame during the combustion of forest fuels in laboratory conditions and in a test site.
A study of the conditions of ignition of a layer of wood as a result of exposure to burning particles formed during a fire has been carried out. Research results show that the ignition process is influenced by the wind speed, the size and number of particles falling on the underlying surface.
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 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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