Infrared Thermographic Diagnostics of Wood Fire Resistance under Combined Thermal Effect Conditions from a Ground Fire Front and Firebrands

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Abstract

Experiments were conducted on certain types of combustible building materials and wood-based structures to determine the interaction between firebrands and forest fuel (FF). Using non-contact IR diagnostic methods in narrow spectral ranges of infrared wavelengths, the heat flux values generated by firebrands and the temperature field of the most heat-stressed sections of the structures under study were determined. Using a JADE J530SB thermal imager with an optical filter of 2,5—2,7 m, temperatures in the range 310—1500 K were measured in the infrared region. In order to interpret the recorded emission from the test sample, calibrations supplied by the narrowband optical filter manufacturer were used.

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About the authors

D. P. Kasymov

National Research Tomsk State University; National Research Tomsk Polytechnic University

Author for correspondence.
Email: denkasymov@gmail.com
Russian Federation, Tomsk; Tomsk

M. V. Agafontsev

National Research Tomsk State University

Email: kim75mva@gmail.com
Russian Federation, Tomsk

V. A. Perminov

National Research Tomsk Polytechnic University

Email: perminov@tpu.ru
Russian Federation, Tomsk

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Supplementary files

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2. Fig. 1. Photo of the experimental stand just before the experiment

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3. Fig. 2. Installation of burning and smouldering particles generation [19]

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4. Fig. 3. Instantaneous thermogram of the process of flame exposure on the model fence structure

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5. Fig. 4. Curves of distribution of the surface temperature field of the considered wood samples in time: a, b - solid fence; c, d - blown type fence (stakes)

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6. Fig. 5. Thermogram of burning development of pine needles near the surface of wooden fence

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7. Fig. 6. Change of flame temperature during pine needles burning: a - experiment with a solid enclosure; b - blown type enclosure

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