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The plasma-assisted reaction kinetic mechanism for high-voltage nanosecond discharge at high pressure was developed for lean and stoichiometric ethanol-gasoline surrogate/O 2 /N 2 /AR mixture. The numerical results show that plasma-assisted ignition of ethanol-gasoline surrogate is mainly associated with the electron impact dissociation of O 2 , nC 7 H 16 , iC 8 H 18  and C 2 H 5 OH molecules and excited O 2 * produced from electron impact during discharge phase. The generation of H and O atoms, radicals and O 2 * facilitates plasma-assisted ignition (PAI). The formation of C 2 H 5 OH + , C 8 H 18+  and O −  increases ignition delay time. PAI improves the ignition stability of lean mixture mainly by increasing the reaction rate in reaction iC 8 H 18 + HO 2 ⇋C 8 H 17 + H 2 O 2 . The reaction CH 3 + HO 2 ⇋CH 4 + O 2  promotes auto-ignition. But it delays the plasma-assisted ignition of stoichiometric mixture while it facilitates plasma-assisted ignition in lean mixture. The ignition delay time in lean-burn conditions can be shortened only by a proper timing of low-temperature plasma discharge at low temperature.

Kinetics of Low-Temperature Plasma-Assisted Ignition of Ethanol-Gasoline Surrogate under Gasoline Engine like Conditions