Study of the non-gray-TRI effect on the turbulent methane combustion under O-2/CO2 atmosphere
Study of the non-gray-TRI effect on the turbulent methane combustion under O-2/CO2 atmosphere
复制标题
O-2/CO2气氛下甲烷湍流燃烧非灰-TRI效应研究
DOI：
10.1016/j.applthermaleng.2017.11.045
复制
发表时间：
2018
影响因子：
6.4
通讯作者：
Zhang Weijun
中科院分区：
文献类型：
--
作者：
Yi Zhi;Su Zhenggang;Yang Qiangda;Li Guojun;Zhang Weijun
辐射换热是O2/CO2气氛下甲烷湍流燃烧总换热的主要组成部分，准确描述辐射换热是提高燃烧模拟精度的关键，也是一个难点。考虑到O2/CO2气氛下参与介质数量多，辐射-辐射相互作用（TRI）效应显著，采用灰色气体加权和（WSGG）模型计算烟气辐射特性，并对TRI效应进行建模（简称非灰色TRI模型）。在此基础上，对O2/CO2气氛下的湍流甲烷燃烧进行了数值模拟，分析了忽略辐射、灰色模型、灰色-TRI模型和WSGG模型计算的准确性。结果表明，忽略辐射或采用灰色模型会产生较大的误差，采用灰色模型时TRI效应不明显。然而，当使用WSGG模型时，TRI效应降低了燃烧室的总体温度。因此，为了提高O2/CO2气氛下甲烷湍流燃烧的模拟精度，需要采用非灰色TRI模型。
The radiative heat transfer dominates the major part of total heat transfer of turbulent methane combustion under O2/CO2atmosphere, and accurate description of it is difficult but essential for improving the combustion simulation accuracy. Considering the large amount of participating media under O2/CO2atmosphere 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/CO2atmosphere 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/CO2atmosphere.