Abstract
Autoignition characteristics of neat fuels consisting of ethanol, n-butanol, n-heptane (nC7), methyl hexanoate (mhx), and methyl 3-hexenoate (m3h) and their binary and ternary blends were studied in a motored Cooperative Fuels Research (CFR) engine under homogeneous charge compression ignition (HCCI) conditions. The equivalence ratio (ER) and intake temperature were fixed to 0.5 and 155 °C, respectively. Autoignition characteristics were studied through the evolution of CO/CO2 emissions and heat release rate profiles as the compression ratio (CR) was increased. The critical compression ratio (CCR), defined as the CR at which the onset of the autoignition occurs and identified here as the CR where CO2 increases dramatically, varied from 4.8 for neat nC7 to 14.1 for ethanol, which exhibited the lowest reactivity of all fuels. C7 methyl esters exhibited lower CCR than both alcohols, confirming the nonlinear relationship between autoignition trend and cetane number. Results showed that mxh exhibited cool-flam...
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