关键词: 气体辐射/
灰气体加权和模型/
发射率/
离散坐标法
English Abstract
Comprehensive evaluation and analysis of the weighted-sum-of-gray-gases radiation model
Chu Hua-Qiang1,2,Feng Yan1,
Cao Wen-Jian1,
Ren Fei1,
Gu Ming-Yan1,2
1.School of Energy and Environment, Anhui University of Technology, Ma'anshan 243002, China;
2.Key Laboratory of Metallurgical Emission Reduction and Resources Recycling of Ministry of Education, Anhui University of Technology, Ma'anshan 243002, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant Nos. 51676002, 51376008, 51306001) and the Anhui Provincial Natural Science Foundation, China (Grant No. 1408085QE100).Received Date:26 December 2016
Accepted Date:24 February 2017
Published Online:05 May 2017
Abstract:In oxy-fuel combustion with CO2 recycle, the non-gray gas radiative heat transfer characteristics of gaseous participating media are different from those in air-fuel combustion. Therefore, the choice of a non-gray gas radiation model should be carefully made since it plays an important role in modeling the oxy-fuel combustion system. Using the statistical narrow-band model as a benchmark, in this paper we provide a comprehensive assessment of the development of the weighted-sum-of-gray-gase (WSGG) model, which has been achieved in recent years. The results show that the predicted values obtained by the WSGG model are generally reasonably accurate, though some significant differences still exist. For the total emissivity, the WSGG models by Dorigon et al. (2013 Int. J. Heat Mass Transfer 64 863) and Bordbar et al. (2014 Combust. Flame 161 2435) are consistent well with the benchmark model, within a relative error of less than about 20%. Under the conditions of PH2O/PCO2=1 and 2, the magnitudes of radiative heat transfer between two planar plates are calculated using the discrete-ordinate method and WSGG model. It is found that the radiative source and radiative net heat flux obtained using the WSGG model parameters of Dorigon et al. and Bordbar et al. are more accurate than using other parameters developed in the literature (about 10% relative errors). It is worth noting that the WSGG model parameters of Jonhansson et al. (2011 Combust. Flame 158 893) and Bordbar et al. have a wider range of applications.
Keywords: non-gray gas radiation/
weighted-sum-of-gray-gases model/
total emissivity/
discrete-ordinate method
