Abstract
This work offers a pathway to increase the combustion efficiency and reduce the pollutant emissions for the homogeneous charge autoignition (HCAI) mode of combustion. The combustion and emission characteristics of n-heptane–PODE3–ethanol mixtures were measured under constant volume conditions at a pressure of 2.703 MPa and equivalence ratio of 0.4–1.0. The fuel reactivity was varied by changing the blending ratio of high cetane number fuel and high octane number fuel. The main results are summarized below: First, the fuel reactivity should be adjusted according to the equivalence ratio to improve the combustion load adaptability. At fuel-lean conditions, the proportion of high cetane number fuel should increase to strengthen the ignition and combustion stability. As the load approaches the stoichiometric condition, the proportion of the high octane number fuel should increase to form a homogeneous charge to elevate the combustion efficiency. Pure n-heptane achieves the maximal combustion efficiency up to ...
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