Assessment of various Full-Spectrum Correlated K-distribution methods in radiative heat transfer in oxy-fuel sooting flames

Abstract

Thermal radiation plays an important role in heat transfer process in oxy-fuel sooting flame (OFS). The accuracy of Full-Spectrum Correlated K-distribution (FSCK) methods with the original scheme (Modest and Zhang, 2002), the improved one (Cai and Modest, 2014), and the rank correlated one (Solovjov and Webb, 2018) is evaluated in two OFSs. As a comparison, two oxy-fuel non-sooting flames (OFNSs) are constructed as well. The performance of these three schemes in OFSs is basically consistent with that in OFNSs except for the original scheme in the high-soot-concentration regions. The original scheme displays larger errors than the other two schemes in the high-temperature regions, especially in the high-soot-concentration regions, though the error is quite small. The improved scheme provides excellent accuracy in the high-temperature regions, but significant errors in the low-temperature regions, which results in an overestimation of temperature by 38.8 K. The rank correlated scheme displays the best accuracy in both OFSs and OFNSs. Furthermore, the reference (or Planck) temperature has obvious impacts on the accuracy of original scheme, but has much weaker effects on the improved and rank correlated schemes.