Abstract
Numerical Study with detailed chemistry has been conducted to investigate the name structure and NOx formation characteristics in oxygen-enhanced(CH₄/O₂-N₂) and oxygen-enhanced-EGR(CH₄/O₂CO₂) counter diffusion name with various strain rates. A small amount of N₂ is included in oxygen-enhanced-EGR combustion, in order to consider the inevitable N₂ contamination by O₂ production process or air infiltration. The results are as follows : In CH₄/O₂CO₂ name it is very important to adopt a radiation effect precisely because the effect of radiation changes flame structure significantly. In CH₄/O₂N₂ name special strategy to minimize NO emission is needed because it is very sensitive to a small amount of N₂. Special attention is needed on CO emission by flame quenching, because of increased CO concentration. Spatial NO production rate of oxygen-enhanced combustion is different from that of air and oxygen-enhanced-EGR combustion in that thermal mechanism plays a role of destruction as well as production. In case CH₄/O₂-CO₂ name contains more than 40% CO₂ it is possible to maintain the same EINO as that of CH₄/Air name with accomplishing higher temperature than that of CH4/Air flame. EINO decreases with increasing strain rate, and those effects are augmented in CH₄/O₂ flame.
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