15 January 1998 Method for fast computation of infrared radiation from heated turbulent jets viewed through thick atmospheric layers
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Abstract
The simple effective method for computing the spectral thermal radiation intensity from jets of hydrocarbon fuel combustion products viewing through thick atmosphere layers is proposed. The method is based on (1) similarity of radiation characteristics of optically thin turbulent jets and (2) three-group approximation. The first approach can be used because jet radiation filtered by sufficiently thick atmospheric layer is concentrated mainly at frequencies where radiating volume is optically thin. Within three-group approximation developed for radiation transfer calculation in molecular rotational-vibrational bands the lines in each spectral interval are approximated by several (up to 3) groups of lines with the same lower energy levels. This allows one to account for the contribution of so called 'hot' lines that arise due to transitions between excited states and are weakly absorbed in low temperature atmosphere.
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Andrey I. Bril, Andrey I. Bril, Vitaliy P. Kabashnikov, Vitaliy P. Kabashnikov, Yuri V. Khodyko, Yuri V. Khodyko, Natalya V. Kuzmina, Natalya V. Kuzmina, "Method for fast computation of infrared radiation from heated turbulent jets viewed through thick atmospheric layers", Proc. SPIE 3219, Optics in Atmospheric Propagation and Adaptive Systems II, (15 January 1998); doi: 10.1117/12.298055; https://doi.org/10.1117/12.298055
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