The influence of nozzle sac volume on the composition of the fuel derived solvent organic fraction of diesel particulate from a naturally aspirated 1 litre per cylinder diesel engine was studied. Significant differences in the quantities of the polycyclic aromatic compounds for different sac volumes were found. The emission differences were due to the reduction of unburnt fuel contributions to particulate SOF as the sac volume was reduced.
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Farrar-Khan et al. (1992) studied this question.
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