Improvement of Combustion System of a Small D.I. Diesel Engine for Low Exhaust Emissions

Improvement of combustion system for low emissions of a single cylinder diesel engine is presented. In particular the effects of spray angle, holes diameter and number, compression ratio and combustion chamber geometry on engine performance and emissions are evaluated.

The fluid-dynamic behaviour of combustion system is analyzed by LDA technique.

Engine tests have been carried out at two engine speed and at different start of combustion. The particulate matter has been analyzed in terms of soluble organic fraction and dry soot.