Efficient full-spectrum correlated-k-distribution look-up table

Abstract

To improve the efficiency of full-spectrum k-distribution look-up tables a new scheme has been devised to store correlated k-values. Unlike the previous look-up table developed by the authors [9,10], from which full-spectrum k-distributions must be determined with multi-step interpolations, the new table stores correlated values, which can be directly retrieved from the new table avoiding several calculations and interpolations, thus saving considerable CPU time during radiative calculations. The same species as in the previous table, i.e., CO2, H2O, CO and soot, are included in the new table, for which the construction details are illustrated. Previous and new tables as well as their implementations are compared in this work. Calculations of radiative heat sources for two scaled flames are employed to validate the new table. Results show that the new table gives results of similar accuracy but at considerably cheaper computational cost than the previous table for both gas mixtures and gas-soot mixtures.