LAUSR

This work provides the target-oriented fuel design concept for efficient, clean combustion and identifies the functional configuration of fuel components for the homogeneous charge autoignition (HCAI) combustion mode. The n-heptane–PODE3–ethanol mixture is applied to exemplify the fuel design process. The interaction among n-heptane, PODE3, and ethanol for the heat release process and the role of PODE3 and ethanol on the soot precursors (n-C4H3, C2H2, C3H3, CH3, C2H4, and C4H4) reduction are also discussed. The main conclusions are summarized below: First, the 60% n-heptane–20% PODE3–20% ethanol exhibits distinct low temperature heat release, first high temperature heat release (HTHR) and second HTHR which are contributed by PODE3/n-heptane, n-heptane/ethanol, and ethanol, respectively. The dominant rate controlling reactions for OH accumulation are H atom abstraction from n-heptane and ketohydroperoxide decomposition of n-heptane. Therefore, n-heptane is the major ignition source, while PODE3 works as th...