Absorption and chemical properties of combustion cycle resolved in-cylinder diesel soot

INTRODUCTION Soot or black carbon (BC) emissions reduce air quality and increase the absorption of solar radiation in the atmosphere. Diesel engines contribute to approximately 20% of the global BC emissions (Bond et al., 2013). Engine operating conditions alter the magnitude of particle emissions and may drastically change soot characteristics, such as light absorbance and scattering. The mechanisms and time scales of soot formation, oxidation and the transformation of soot properties in the cylinder are poorly understood. In this project, in-cylinder particle properties are analyzed with the aim to improve soot emission modelling and to reduce toxic and climate relevant particle emissions from combustion engines.

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