On band lumping, radiation reabsorption, and high-pressure effects in laminar flame propagation
作者： Shu Zheng , Ran Sui , Wenkai Liang , Huaichun Zhou , Chung K. Law
DOI: 10.1016/J.COMBUSTFLAME.2020.07.042
关键词: Materials science 、 Radiative transfer 、 Molecular physics 、 Radiation 、 Flux 、 Laminar flow 、 Flame propagation 、 Spectral bands 、 High pressure 、 Reabsorption
摘要: Abstract Effects of radiation reabsorption on the burning flux freely propagating laminar premixed flames at atmospheric and elevated pressures were numerically investigated for CH4/O2/N2/CO2 mixtures. Models with SNBCK 9 bands 7 based spectral band lumping H2O, CO2, CO CH4 developed to improve computational efficiency. It is found that promoted by upstream increasing CO2 concentration. Furthermore, pressure, first increases then reduces because corresponding efficiency optical thickness, respectively. The blockage emission from burnt mixture due increased thickness dominant addition stronger radiative species higher pressures. Extensive computation further demonstrates that, compared benchmark case 367 bands, retains good accuracy while substantially facilitates
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