Study of the non-gray-TRI effect on the turbulent methane combustion under O2/CO2 atmosphere. (5th February 2018)

• Record Type: Journal Article
• Authors: Yi, Zhi; Su, Zhenggang; Yang, Qiangda; Li, Guojun; Zhang, Weijun
• Is Part Of: Applied thermal engineering. Volume 130(2018)
• Page Start: 449
• Page End: 457
• Publication Date: 2018-02-05
• Subjects: O2/CO2 combustion -- Gray model -- Weighted-sum-of-gray-gases model -- Turbulence-radiation interaction; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2017.11.045
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: The turbulent methane combustion under O2 /CO2 atmosphere is studied. The gray and WSGG models are adopted to calculate the absorption coefficients. The turbulence-radiation interaction is modeled and analyzed. Abstract: The radiative heat transfer dominates the major part of total heat transfer of turbulent methane combustion under O2 /CO2 atmosphere, and accurate description of it is difficult but essential for improving the combustion simulation accuracy. Considering the large amount of participating media under O2 /CO2 atmosphere and the remarkable turbulence-radiation interaction (TRI) effect, the weighted-sum-of-gray-gases (WSGG) model is adopted to calculate radiative properties of flue gas and the TRI effect is modeled (referred to as non-gray-TRI model). Based on the above model verified by experiment results of the relevant literature, the turbulent methane combustion under O2 /CO2 atmosphere is simulated, and the accuracy of ignoring radiation or calculating by gray model, gray-TRI model and WSGG model are analyzed respectively. The results indicate that ignoring the radiation or using the gray model will produce substantial errors, and the TRI effect is not obvious when using the gray model. However, the TRI effect reduces the overall temperature of the combustion chamber when using the WSGG model. Therefore, the non-gray-TRI model is necessary to improve the simulation accuracy of turbulent methane combustion under O2 /CO2 atmosphere.