气粒混合物非灰辐射特性合并宽窄谱带K分布模型

气粒混合物辐射问题具有全场性、非灰性、耦合性等特点,准确预估高温燃气/粒子非灰辐射特性是非常重要的。本文将合并宽窄谱带K分布模础(CWNBCK)与离散坐标法(DOM)结合,开展了非灰气粒混合物辐射换热问题的模拟工作,分别验证了一维和三维情况下应用该模型的准确性,给出不同工况下的热流源项、壁面热流或辐射热流等。结果表明:该模型能够给出与SNB模型精度基本相同的结果,考虑其计算效率的提高,可以在工程实际中应用该模型计算非灰气粒混合物辐射换热。

Combined Wide and Narrow Band Correlated-K Model for Nongray Thermal Radiation in Gas and Particle Mixture

The thermal radiation of gas and particle mixture is a whole filed’s,nongray and coupled problem,it is very important to accurately estimate nongray radiative properties of high temperature gas and particle mixture.In this paper,by combining the combined wide and narrow band correlated-k model(CWNBCK) with discreted ordinate model(DOM),the nongray radiative heat transfer in gas and particle mixture are investigated by this method,the applicability of this method for solving 1D and 3D problem are respectively validated,and radiative source term,wall heat flux or radiative flux are presented for different conditions.The results show that the present method’s accuracy is close to SNB model,but compute efficiency is higher,can be applied to simulate nongray radiative heat transfer of gas and particle mixture.