Study of the influence of a model fire on the characteristics of turbulence in the atmosphere
E.L. Loboda1,2, A.V. Lutsenko1,2, D.P. Kasymov1,2, M.V. Agafontsev1,2, I.A. Kolesnikov1
1National Research Tomsk State University, Tomsk, Russia
2V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: wildland fire, crown fire, turbulence, turbulence scale, atmosphere, combustion, dissipation
Abstract
This paper analyzes and generalizes the results of studies of turbulence in flame and in the vicinity of the combustion source during model steppe and crown fires in the period from 2019 to 2022 at the Base Experimental Complex of Institute of Atmospheric Optics SB RAS. The spectra of air temperature changes and the scales of induced atmospheric turbulence in the vicinity of the front of a model fire are obtained. For a steppe fire, the air temperature pulsation frequency ranges corresponding to the inertial and dissipative sections of the energy spectrum are found; dissipative processes begin to form at an altitude of 10 m at wave numbers with lgk > 1.58 and the corresponding pulsation frequency ƒ > 3 Hz; at an altitude of 3 m, dissipative processes are not observed. During a model crown fire, turbulent processes in the atmosphere correspond to the inertial part of the energy spectrum at an altitude of 10 m, and dissipative processes practically do not manifest themselves.
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