Infrared Diagnostics of Turbulence in the Front of Wildland Fire and the Formation of Induced Atmospheric Turbulence

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Abstract

An infrared diagnostic of the scale of turbulence in the front of a natural fire is presented, as well as a comparison with the scale of turbulence in the air near the combustion source for a model grassland and crown fire. An analysis of the flame of a grassland fire reveals smaller turbulence scales than the flame of a crown fire. A fire-induced atmospheric turbulence at a height of 10 m is observed with the corresponding frequency of air temperature pulsation (0.1-6 Hz for a steppe fire and 0.1-3 Hz for a crown fire). The values of the structural functions of refractive index and temperature fluctuations are significantly higher than the background values and can be used for remote fire detection.

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About the authors

A. V. Lutsenko

Tomsk State National Research University

Author for correspondence.
Email: anastas_mex_mat434@mail.ru
Russian Federation, 36, Lenin Ave., Tomsk, 634050

E. L. Loboda

Tomsk State National Research University

Email: loboda@mail.tsu.ru
Russian Federation, 36, Lenin Ave., Tomsk, 634050

D. P. Kasymov

Tomsk State National Research University

Email: denkasymov@gmail.com
Russian Federation, 36, Lenin Ave., Tomsk, 634050

M. V. Agafontsev

Tomsk State National Research University

Email: kim75mva@gmail.com
Russian Federation, 36, Lenin Ave., Tomsk, 634050

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Supplementary files

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2. Fig. 1. Scheme of the experimental plot and location of measuring equipment (steppe fire): 1 - experimental plot 15×3 m; 2 - ignition strip; 3 - weather station AMK-03 on a mast 10 m; 4 - infrared camera JADE J530SB; 5 - video camera.

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3. Fig. 2. Scheme of the experimental plot and location of measuring equipment (overhead fire): 1 - experimental plot 10 × 4 m; 2 - ignition lane; 3 - ‘acceleration plot’; 4 - area of undergrowth and bushes; 5 - model forest canopy (pine trees 2-3 m high); 6 - model forest canopy (pine trees 3-4 m high); 7 - rack with thermocouples; 8 - recording and recording equipment; 9 - IR camera JADE J530SB; 10 - video camera; 11 - weather station AMK-03 on a mast 10 m.

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4. Fig. 3. Thermogram of the burning front of a model steppe fire and temperature change in the flame.

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5. Fig. 4. Temperature pulsation spectrum in the flame at L / 2 height (a) and at L height (b) for a steppe fire.

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6. Fig. 5. Air temperature pulsation spectra at 3 and 10 m height: before the experiment at 3 m height for steppe (a) and upland (b) fires; during the experiment at 3 m height (c - steppe, d - upland) and 10 m height (e - steppe, f - upland).

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7. Fig. 6. Change of local characteristics of the atmosphere in the vicinity of the burning centre for a steppe fire: a - change of the structural function of the refractive index C2n (optical); b - change of the structural constant of temperature fluctuation C2T.

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8. Fig. 7. Change of local characteristics of the atmosphere in the vicinity of the combustion centre for the upper fire: a - change of the structural function of the refractive index C2n (optical); b - change of the structural constant of temperature fluctuation C2T.

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