Abstract
To understand the fundamental mechanisms of NO formation in natural gas-diesel dual fuel combustion, a numerical study on NO formation in laminar counterflow methane (CH4)/n-heptane (n-C7H16) dual fuel flames is conducted. The results reveal that the flame structure and NO formation vary with the fuel equivalence ratio. For a given n-C7H16/air mixture, the NO emission index decreases with increasing the equivalence ratio of the CH4/air mixture (φ(CH4/air)). The NO formation route analysis suggests that the prompt and thermal routes dominate the NO formation. The increase in φ(CH4/air) causes the decrease in the contribution of the prompt route to overall NO formation. NO formation by prompt route is mainly caused by rich n-C7H16 combustion. As φ(CH4/air) increases, the mole fractions of the radicals (OH, O and H) related to CH formation in the reaction zone of rich n-C7H16/air flame branch are decreased, which reduces the formation of NO by prompt route.
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