Characteristics of combustion and heat transfer in the high temperature air combustion furnace were analyzed by assuming -radiative properties of combustion gases that were nongray and inhomogeneous medium. The high temperature air combustion utilized in industrial furnaces produces higher thermal efficiency and lower carbon dioxide and nitrogen oxides emissions. The characteristics of heat transfer and combustion in the high temperature air combustion have not been explained clearly. It is necessary to solve unsteady high temperature air combustion which uses the regenerative burners alternately. Radiation occupies the heat transfer in combustion furnaces so the estiamtion of radiative heat transfer is important in the combustion simulations. While there are luminous flames in popular industrial furnaces, the flame luminance of the high temeprature air combustion is very low. To estiamte the radiation field of the high temperature air combustion accurately, the radiative properties of gases should be calculated by the nongray gas models. In this study, the high temperature air combustion is analyzed to calculate the unsteady state equations in three-dimensional coordinate system. The discrete-ordinates method was used to solve radiative transfer equations. The exponential wide-band model was used as the nongray gas model.
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