燃烧过程中气体辐射特性分析

水蒸气、二氧化碳和一氧化碳是燃烧过程中的气体生成物,对燃烧系统内的辐射换热有重要影响。比较2个窄谱带数据库参数,即SoufianiTaine数据库和RiviereSoufiani数据库,针对参与性气体的非灰辐射特性,采用统计窄谱带模型考察水蒸气、二氧化碳和一氧化碳3种气体的光谱透射率。结果表明,基于RiviereSoufiani数据库的计算结果与逐线法基准解吻合较好,SoufianiTaine数据库偏差较大。引入离散坐标法,利用2个窄谱带数据库和统计窄谱带关联K模型,研究一维、二维和三维火焰的辐射换热情况,比较发现,采用2个数据库所得的辐射热流和辐射密度差别不大,仅在温度跃变处相差较大。

Analysis of Gas Radiative Characteristic in Combustion

Water vapor,carbon dioxide and carbon monoxide are the common combustion production and play an important role for radiative heat transfer in combustion system.The two narrow band databases （Soufiani ＆ Taine database and Riviere ＆ Soufiani database） were compared.For the non gray character of gases,the spectral transmissivity was investigated.The results show that Riviear ＆ Soufiani database is more accurate.With the discrete ordinates method and the statistical narrow-band correlated-K model,the radiative heat transfer from the flame in one-dimensional enclosure,two-dimensional enclosure and three-dimensional enclosure were calculated.In all the cases tested,the results using Soufiani ＆ Taine database and Riviere ＆ Soufiani database are more accurate.For the higher temperature gases,the latter is in better agreement with the benchmark solutions of radiative heat transfer.