Annual Reviews of Heat Transfer
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ARTICLE:
S. H. Chan ABSTRACT This work reviews the interaction between radiation and combustion. In particular, the role of radiative transfer in flame structure, pollutant emission, and flame extinction is reported. Most of the previous flame radiation studies decouple combustion and radiation. Flame radiation is calculated a posteriori, namely, based on adiabatic flame temperature, which is determined beforehand from combustion analysis without considering the radiative transfer effect. Recent studies began to couple thermal radiation with reaction kinetics in fundamental combustion studies. The structure of radiating laminar flamelets of CH4-air nonpremixed flames is now available. Radiative transfer is found to significantly affect the flame temperature and the formation of important minor species like NOx emission. Another profound radiation effect is to induce a new flame extinction limit at a low stretching condition. Finally, the effects of soot formation on flame structure and flame radiation are reviewed. While soot formation contributes to a larger Planck mean absorption coefficient, it lowers the flame temperature. The opposing effect dampens the effectiveness of soot formation on flame radiation enhancement in methane-air flames. 49-64 pages |
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