Data Base of WSGGM-based Spectral Model for Radiation Properties of Combustion Products

Abstract

This work completes the preceding low-resolution spectral modeling of the authors based on water vapor. It is extended to water vapor, carbon dioxide and their mixtures by applying the weighted-sum-of-gray-gases model (WSGGM) to each narrow band. Proper modeling scheme of gray-gas absorption coefficients vs. temperature relation is suggested. Comparison between the modeled emissivity calculated from this relation and the 'true' emissivity obtained from the high-temperature statistical narrow band parameters (Soufiani and Taine. Int J Heat Mass Transfer 1997;40:987-91) is made for a few typical narrow bands. Low-resolution spectral intensities from one-dimensional layers are also obtained and examined for uniform, parabolic and boundary layer-type temperature profiles using the obtained WSGGMs with several gray gases. The results are compared with the narrow band spectral intensities obtained by a narrow band model-based code with the Curtis-Godson approximation. Good agreement is found between them. Database including optimized modeling parameters and total and low-resolution spectral weighting factors are developed for water vapor, carbon dioxide and their mixtures. This model and obtained data bases, available from the authors' internet site, can be appropriately applied to any radiative transfer equation solver. (C) 1999 Elsevier Science Ltd. All rights reserved.