Emission of ions and charged soot particles by aircraft engines A. Sorokin1, X. Vancassel2, and P. Mirabel2 1Central Institute of Aviation Motors, 2 Aviamotornaya Str., 111116, Moscow, Russia 2Centre de Géochimie de la Surface, CNRS and Université Louis Pasteur 1, Rue Blessig, F-67084 Strasbourg France
Abstract. In this article, a model which examines the formation and evolution of chemiions in an
aircraft engine is proposed. This model which includes chemiionisation, electron thermo-emission,
electron attachment to soot particles and to neutral molecules, electron-ion and ion-ion recombination, ion-soot interaction, allows the determination of the ion concentration at
the exit of the combustor and at the nozzle exit of the engine. It also allows the determination
of the charge of the soot particles. For the engine considered, the upper limit for the ion
emission index EIi is of the order of (2-5) x1016
ions/kg-fuel if ion-soot interactions are ignored and the introduction of ion-soot interactions lead about to a 50% reduction. The
results also show that most of the soot particles are either positively or negatively charged, the
remaining neutral particles representing approximately 20% of the total particles. A
comparison of the model results with the available ground-based experimental data obtained
on the ATTAS research aircraft engines during the SULFUR experiments (Schumann, 2002)
shows an excellent agreement.
Citation: Sorokin, A., Vancassel, X., and Mirabel, P.: Emission of ions and charged soot particles by aircraft engines, Atmos. Chem. Phys., 3, 325-334, doi:10.5194/acp-3-325-2003, 2003.