Abstract
The autoignition characteristics of n-heptane/hydrogen were investigated numerically. The effects of the temperature, fuel compositions and Exhaust gas recirculation (EGR) on the autoignition characteristics were evaluated. The numerical study on the ignition delay time was performed using the CHEMKIN-PRO software to calculate ignition delay time and predict the chemical species in the combustion process. The results revealed that ignition delay time decreased with an increase in the hydrogen fraction in the mixture in low temperature regime, but the opposite behavior observed in high temperature regime. The oxidation reaction of n-heptane in low temperature regime is limited with increasing mole fraction of hydrogen in blended fuel. Thus, cool flame which is characteristics of n-heptane is weakened. As consumption rate of n-heptane and temperature are decreased, total reactivity is decreased. The ignition delay time sharply decrease with EGR due to intermediate species in the exhaust gas.
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