Nongray radiation from gas and soot mixtures in planar plates based on statistical narrow-band spectral model

Huaqiang CHU, Qiang CHENG, Huaichun ZHOU, Fengshan LIU

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PDF(553 KB)
Front. Energy ›› 2011, Vol. 5 ›› Issue (2) : 149-158. DOI: 10.1007/s11708-010-0124-8
RESEARCH ARTICLE

Nongray radiation from gas and soot mixtures in planar plates based on statistical narrow-band spectral model

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Abstract

The nongray behavior of combustion products plays an important role in various areas of engineering. Based on the statistical narrow-band (SNB) spectral model with an exponential-tailed inverse intensity distribution and the ray-tracing method, a comprehensive investigation of the influence of soot on nongray radiation from mixtures containing H2O/N2+soot, CO2/N2+soot, or H2O/CO2/N2+soot was conducted in this paper. In combustion applications, radiation transfer is significantly enhanced by soot due to its spectrally continuous emission. The effect of soot volume fraction up to 1×10-6 on the source term, the narrow-band radiation intensities along a line-of-sight, and the net wall heat fluxes were investigated for a wide range of temperature. The effect of soot was significant and became increasingly drastic with the increase of soot loading.

Keywords

soot / combustion / SNB model / nongray radiation

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Huaqiang CHU, Qiang CHENG, Huaichun ZHOU, Fengshan LIU. Nongray radiation from gas and soot mixtures in planar plates based on statistical narrow-band spectral model. Front Energ Power Eng Chin, 2011, 5(2): 149‒158 https://doi.org/10.1007/s11708-010-0124-8

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 50636010, 50906027).
Notations
fspecies molar fraction
Iradiation intensity/(W·m-2·sr-1)
Ivspectral radiation intensity/(W·m-2·sr-1·cm-1)
kvmean line-intensity to spacing ratio/(cm-1·atm-1)
k¯vequivalent mean line-intensity to spacing ratio/(cm-1·atm-1)
Lseparation distance between parallel walls/m
ppressure/atm
qheat flux density/(kW·m-2)
s,sposition variables/m
xCartesian coordinates/m
β¯vmean line-width to spacing ratio
γ¯vmean half-width of an absorption line/cm-1
δ¯vequivalent line spacing/cm-1
Δvwavenumber interval/cm-1
νwavenumber/cm-1
μdirection cosines
τνspectral transmittance
Subscripts
bblackbody
ispatial discretization (along a line-of-sight) index
nangular discretization index
wwall

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