大量EGR・低温ディーゼル燃焼排気中の微粒子粒径分布(熱工学,内燃機関,動力など)

概要

論文の詳細を見る
Particle size distribution, mean diameter, and number density of nano-PM (Particulate Matter) in the exhaust gas from a single cylinder DI diesel engine with high rates of cooled EGR (Exhaust Gas Recirculation) were studied using SMPS (Scanning Mobility Particle Sizer), and the effects of the exhaust catalyst and fuel injection quantity (engine load) on these characteristics were investigated. With increasing EGR, the peak of the particle size distribution shifts to larger diameters, and the mean diameter and number density increase till the smoke concentration reaches a peak value, and then these values decrease as smoke decreases with further increases in EGR. In the ultra-high EGR smokeless low temperature combustion regime, the nuclei mode particles are dominant and show a peak around 35 nm, the mean diameter and the number density of the particles reach levels lower than those without EGR. Exhaust oxidation catalysts are effective to reduce to some degree the particle number density in a wide EGR range but the effect on the mean diameter is small. More fuel injected into the cylinder causes a larger mean diameter when smoke concentration is high due to EGR, but in the smokeless combustion regime the mean diameter does not change significantly with fuel injection quantity. The reduction in the number density by the catalyst is less significant with a greater fuel injection quantity.
社団法人日本機械学会の論文
2008-05-25