摘要
建立了一种新的宽带k分布模型,从高温气体数据库HITEMP得到二氧化碳气体光谱辐射特性参数,用关联式拟合了其主要谱带的吸收系数。用该模型计算了二氧化碳的辐射热流,与逐线计算、统计窄带模型、窄带k分布模型和全光谱k分布模型作了比较,结果表明:对等温气体,提出的宽带k分布模型和逐线计算结果吻合很好,比全光谱k分布模型更准确。如果积分格式选取合适,宽带k分布模型比统计窄带模型精度高,和窄带k分布模型的精度相当。对灰壁面平板间的非等温气体,宽带k分布模型和逐线计算结果相比误差在10%左右,大大提高了气体辐射特性的计算精度和计算速度。
A novel wide-band k distribution model was established. The spectrum radiative characteristic parameters of carbon dioxide were obtained from a high-temperature gas database HITEMP. A correlation formula was used to perform a fitting of the absorption coefficient of main carbon dioxide spectrum band. The model in question was used to calculate the radiative heat flux of the carbon dioxide. A comparison was made with a line-by-line calculation method,statistical narrow-band model,a narrow-band and a full-spectrum k distribution model. The results of the comparison show that for isothermal gases,the results obtained by using the wide-band k distribution model are in very good agreement with those obtained by using the line-by-line calculation method,even more accurate than those obtained by using the full-spectrum k distribution model. If the integration format is properly chosen,the wide-band k distribution model can attain a calculation accuracy higher than that of the statistical narrow-band model,but comparable to that of the narrow-band k distribution model. For non-isothermal gases between ash wall plates,the calculation error of the wide-band k distribution model is about 10% when its calculation results are compared with those of the line-by-line calculation method,thus greatly enhancing the calculation accuracy and speed of gas radiative characteristics.
出处
《热能动力工程》
CAS
CSCD
北大核心
2008年第4期413-416,共4页
Journal of Engineering for Thermal Energy and Power
基金
国家自然科学基金资助项目(50425619
50636010)
关键词
二氧化碳
宽带K分布模型
辐射热流
carbon dioxide,wide-band k distribution model,radiative heat flux
