Abstract
Particulate matter (PM) exhausted from diesel engines has several serious effects on human health and the environment. The strong health effects of the fine particles, in particular, have been reported recently. In this paper, the measurement of the particle size distribution was performed with a 4-stroke marine diesel engine. A three-cylinder high speed 4-stroke marine diesel engine (3L13AHS) was used as the test engine. The effect of the dilution ratio and the dilution air temperature in the dilution tunnel on particle size distribution was examined using Scanning Mobility Particle Sizer (SMPS) and Electrical Low Pressure Impactor (ELPI). The results show that the number of particles increases with an increase in the dilution ratio or the temperature of dilution air. The dilution ratio and the temperature of dilution air have a strong effect on the generation process of nuclei mode particles.
