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一、前言对连续加热炉数学模型化,目前已取得了较大的发展。但关于炉膛火焰辐射的讨论,却为数很少。由于火焰辐射在炉膛传热中的地位不容忽视,故本文考虑发光火焰在内,利用Hottel区域法建立炉膛传热数学模型。区域法的原理就是在系统的流场,化学释热场及辐射气体的浓度分布已知的条件下,将系统分成许多表面区域Ai和气体体积区域Vi,每个区域足够小,可认为其温度、成份、浓度相等及辐射率均匀。考虑到系统内的各种传热,则可对每个区域列出总能量平衡方程式。表面区域Ai的能量平衡:
First, the preface to the continuous heating furnace mathematical modeling, has achieved greater development. However, there is only a small number of discussions on the flame radiation from the furnace. Because of the position of the flame radiation in the furnace heat transfer, we can use the Hottel method to establish the mathematical model of the furnace heat transfer considering the luminescent flame. The principle of the regional method is that the system is divided into many surface areas Ai and gas volume areas Vi under the conditions that the system flow field, chemical heat release field and the concentration distribution of radiant gas are known. Each area is small enough to be considered as the temperature , Ingredients, concentrations and emissivity equal. Taking into account the various heat transfer within the system, the total energy balance equation can be listed for each area. Energy balance of the surface area Ai: