Abstract
In order to clear the characteristics of nano-PM (nanometer order particle matter) exhausted from diesel engine, PM behavior in exhaust line of small size diesel engine was investigated. In this study, PM number and mass concentration distributions were measured along the exhaust line using SMPS (Scanning Mobility Particle Sizer) and LPI (Low Pressure Impactor). Volatile and non-volatile compositions in PM were separated by drying under 120˚C and 240˚C. As the result, it was shown that number and mass concentrations of larger size PM at downstream part in exhaust line under high speed 0% load condition was higher than those of the upstream part. Smaller size PM at downstream part in exhaust line under 40% load condition was lower than those of the upstream, although smaller size PM under 70% load condition was higher than those of the upstream. Mass concentration of dry240˚C PM under 40% load condition decreased along exhaust line, although mass concentration of dry240˚C under 70% load condition increased. Under 70% load condition, additional soot seems to be formed in the exhaust pipe.
