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

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

Аннотация

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.

Толық мәтін

Рұқсат жабық

Авторлар туралы

A. Lutsenko

Tomsk State National Research University

Хат алмасуға жауапты Автор.
Email: anastas_mex_mat434@mail.ru
Ресей, 36, Lenin Ave., Tomsk, 634050

E. Loboda

Tomsk State National Research University

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

D. Kasymov

Tomsk State National Research University

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

M. Agafontsev

Tomsk State National Research University

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

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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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