@article{oai:nagasaki-u.repo.nii.ac.jp:00020825,
 author = {Ishida, Masahiro and Ueki, Hironobu and Matsumura, Noboru and Chen, Zhi-Li},
 issue = {3},
 journal = {JSME international journal. Ser. B, Fluids and thermal engineering},
 month = {Aug},
 note = {The burned zone excess air ratio λ_d in the diffusion combustion process was analyzed using the two-zone model, and it was compared with the excess air ratio λ_f estimated using a steady diffusion flame model of the fuel spray. It is found that λ_d is dependent on the fuel spray penetration and ignition delay. If the premixed combustion fraction is less than 50%, the NO formation is minimally influenced by the excess air ratio during premixed combustion and is dependent on the excess air ratio λ_d which determines the maximum temperature during diffusion combustion. It is clarified by analysis of the two-zone model that the large reduction in NO_x due to timing retard is mainly caused by decreases in both combustion temperature and combustion pressure, and the small reduction in NO_x occurring when the nozzle-hole diameter is decreased, is due to a small decrease in combustion pressure resulting from a decrease in the heat release rate during premixed combustion., JSME international journal. Ser. B, Fluids and thermal engineering. 1996, 39(3), p.632-639},
 pages = {632--639},
 title = {Diesel Combustion Analysis Based on Two-Zone Model : Examination of Excess Air Ratio in Burned Zone},
 volume = {39},
 year = {1996}
}