Abstract: Bandwidth is an important parameter for gas radiative heat transfer calculation, and a parameter for the calculation of the cumulative distribution function in the correlated-k method. Analysis and calculation show that the constant bandwidth is unreasonable in the calculation of the cumulative distribution function. So bandwidth calculated from the modified wide band model is used in the cumulative distribution function calculation. Comparison with the narrow band correlated-k method shows that the present method is more precise than the traditional one.

Key words: gas radiation, correlated-kmethod, modified calculation