气体辐射特性计算模型的选择对于辐射热传递的计算至关重要。对采用宽带k分布模型和其它气体辐射特性计算模型计算的于两无限大平板间非等温气体辐射传递的精度进行了比较结果显示：宽带k分布模型与逐线计算结果吻合较好，比总体模型的计算精度高得多。计算结果说明:对于非等温介质，关联k假设在较大的光谱区间内相对有效，且能通过将单一气体的k分布吸收系数相加获得水蒸气和二氧化碳混合气体的k分布吸收系数的，该处理方法简单易行，宽带k分布模型很适合气体辐射换热问题的求解。

The selection of gas radiation characteristics models is very important for the calculation of radiation heat transfer.The accuracy of wide band kdistribution model with other gas radiation characteristics models for nonisothermal gas radiation transfer between two infinite plates is compared.The results show that the wide band kdistribution model is in good agreement with the linebyline calculation results,and the calculation accuracy of wide band kdistribution model is much higher than that of the global model.Because correlation k assumption is relatively effective for nonisothermal media in a larger spectral range,and the kdistribution absorption coefficients of H2OCO2 mixed gases is obtained by adding the kdistribution absorption coefficients of single gases,the wide band kdistribution model is very suitable for solving the problem of gas radiation heat transfer.

TK124

国家自然科学基金（51706209,51604245）；河南省科技攻关项目（202102210071）；河南省高校青年骨干教师培养计划（2017GGJS094）