Abstract
The purpose of this paper is to investigate the turbulent combustion properties of CH4/O2 mixtures diluted by CO2 compared to those of CH4/O2/N2 mixtures to study the feasibility of new combustion method, which is expected to be effective in the NOx reduction and the improvement of combustion. Experiments are conducted by using spherical combustion bomb for applications to internal combustion engines. Consequently, it is shown that CH4/O2/CO2 mixtures have larger turbulent burning velocity as compared to CH4/O2/N2 mixtures under almost the same turbulent condition. Furthermore these mechanisms are discussed in view of change in local burning velocity due to flame stretch. As a result it is concluded that the differences in Markstein number between the CH4/O2/CO2 mixtures and CH4/O2/N2 mixtures, which are mainly due to the differences in Lewis number, cause the relative change in local burning velocity and this leads to the relative increase in the turbulent burning velocity in favor of CH4/O2/CO2 mixtures.
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