燃烧过程中气体辐射特性分析

Analysis of Gas Radiative Characteristic in Combustion

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Soufiani&Taine数据库和Riviere&Soufiani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Riviere&Soufiani数据库的计算结果与逐线法基准解吻合较好,Soufiani&Taine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。

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.