UDC 535.8
CSCSTI 29.31
Russian Classification of Professions by Education 03.04.02
Russian Library and Bibliographic Classification 223
Russian Trade and Bibliographic Classification 6135
BISAK SCI053000 Physics / Optics & Light
We studied the influence of scale effects on turbulence within the combustion zone and turbulence characteristics in the atmosphere surrounding the combustion zone. A JADE J530SB infrared camera, operating at 50 frames per second in a narrow spectral range of 2.5-2.7 μm, was used to monitor the temperature field in the fire front and the flame structure. Analysis of turbulence scales within the flame indicates that exothermic reactions cause a slight increase in the size of turbulent structures due to expansion. Subsequently, as oxidation reactions complete, these turbulent structures rise due to convective processes and induce atmospheric turbulence. The scales of this induced turbulence differ slightly from those observed within the flame. These structures are preserved up to a height of 10 m. Analysis of the data reveals that turbulence scales in the middle of the flame range from 1.5 m to 0.1 m, while in the upper part of the flame, they range from 0.9 m to 0.1 m. Using the technique described by [1], we also obtained atmospheric turbulence scales at heights of 3 m, 6 m, and 10 m. Atmospheric turbulence scales ranged from 2.4 m to 0.09 m at a height of 3 m, from 3.9 m to 0.1 m at 6 m, and from 12 m to 0.1 m at 10 m.
atmospheric turbulence, flame, IR-thermography method
1. Popovicheva O., Kistler M., Kireeva E., Persiantseva N., Timofeev M., Kopeikin V., Kasper-Giebl A. Physicochemical characterization of smoke aerosol during large-scale wildfires: Extreme event of August 2010 in Moscow // Atmos. Environ. – 2014. 96. – Pp. 405–414, https://doi.org/10.1016/j.atmosenv.2014.03.026, 2014.
2. McRae D. J., Jin J.-Z., Conard S. G., Sukhinin A. I., Ivanova G. A., Blake T. W. Infrared characterization of fine-scale variability in behavior of boreal forest fires // Canadian Journal of Forest Research – 2005. 35(9) – Pp. 2194–2206. https://doi.org/10.1139/x05-096.
3. Coen J., Mahalingam S., Daily J. Infrared imagery of crown-fire dynamics during FROSTFIRE // Journal of Applied Meteorology and Climatology. 2004. 43(9). Pp. 1241–1259. https://doi.org/10.1175/1520-0450(2004)043<1241:IIOCDD>2.0.CO;2
4. Loboda E.L., Lucenko A.V., Kasymov D.P. (IOA, TGU), Agafoncev M.V., Kolesnikov I.A. Vliyanie model'nogo pozhara na harakteristiki turbulentnosti v atmosfere // Optika atmosfery i okeana. – 2023. – T. 36, № 10(417). – S. 854-860. – DOIhttps://doi.org/10.15372/AOO20231010.
5. Loboda E.L., Reyno V.V., Agafoncev M.V. Primenenie termografii pri issledovanii processov goreniya. Tomsk: Izd-vo Tom. un-ta, 2016. 80 s.
