title: Influence of engine operating conditions on diesel particulate matter emissions in relation to transient and steady-state conditions.
abstract: Airborne particulate matter is an important pollutant affecting air quality. Currently, diesel PM regulations are based on emitted particle mass; however, the particle size distributions are also important factors in air quality. While the distributions of particulate emissions under steady-state conditions are well-known and have been generalized, varying distributions undertransient conditions are not well-understood. This study investigates the size distributions of PM, focusing on the nuclei- and accumulation-modes, emitted from diesel engines under transient operations. Some engine conditions during transient testing produced particle size distributions that were notably different from those produced under steady-state conditions. During transient operation, the size distributions were either mono- or bimodal with peaks that were able to switch quickly between the nuclei- and accumulation-modes. These distributions have not been observed during steady-state testing but are significant because environmental and health effects and emission control solutions are highly dependent on particle size.
authors: Cummins Filtration and Emission Solutions, Stoughton, Wisconsin 53589, USA. jerry.z.liu@cummins.com
authors: Z Gerald
authors: ZG
authors: Liu
authors: Denise C
authors: DC
authors: Ford
authors: Victoria N
authors: VN
authors: Vasys
authors: Da-Ren
authors: DR
authors: Chen
authors: Timothy R
authors: TR
authors: Johnson
mesh_terms: D000393:Air Pollutants; D010316:Particle Size; D015203:Reproducibility of Results; D001335:Vehicle Emissions
chemical_list: D000393:Air Pollutants; D001335:Vehicle Emissions