Stoichiometric, undiluted, spark-ignition gasoline engines are limited in their ultimate efficiency by the autoignition resistance of fuels available for consumption. Consequently, the autoignition of fuel-oxidizer “end-gas” (the remaining mixture which has not yet been consumed by the flame) in these engines has been the subject of research for over a century, and much has been learned about the autoignition processes of this class of fuels, both in engines and in fundamental experiments. Despite this, significant research interest still remains in this topic, due to three factors: the evolution of gasoline engines and how this evolution has influenced the autoignition process; the evolution of gasoline formulation and its influence on autoignition kinetics; and the advent of lean-burn gasoline engines which rely on autoignition for operation. This talk will summarize recent research conducted at Sandia National Laboratory on gasoline autoignition in both stoichiometric and lean-burn spark-ignited engines.
David Vuilleumier is a Postdoctoral Appointee at the Combustion Research Facility in Sandia National Laboratories. His research focuses on the interactions between fuel formulation and internal-combustion engine operation. This includes the study of autoignition of gasoline-type fuels, the enabling of advanced operating modes through fuel formulation, and the interactions between fuel characteristics and mixture formation.