TY - JOUR
TI - Improvement of emissions and performance by using of air jet, exhaust gas re-circulation and insulation methods in a direct injection diesel engine
AU - Jafarmadar Samad
AU - Hosenzadeh M
JN - Thermal Science
PY - 2013
VL - 17
IS - 1
SP - 57
EP - 70
PT - Article
AB - This article investigates the improvement of operation characteristics and  emissions reduction by means of creating an air-cell inside the piston body,  exhaust gases recirculating and insulating combustion chamber in a direct  injection diesel engine simultaneously. The engine considered is a  caterpillar 3401 which was modeled with an air-cell included as part of the  piston geometry. This air-cell demonstrates that air injection in late  combustion period can be effective in a significant reduction of Soot  emission while cold EGR can be effective in reduction of NOx emission. Also  for increasing of performance parameters, combustion chamber with air-cell is  insulated. The analyses are carried out at part (75% of full load) and full  load conditions at the same engine speed 1600 rpm. The obtained results  indicate that creating the air-cell has a slight effect on improvement of  performance parameters and it has significantly effect on Soot reduction. The  air-cell decreases the Soot pollutant as a factor of two at both part and  full load conditions. Also, the adding 5% of cold EGR in inlet air decreases  NOx by about half and insulating the engine increases the power and IMEP by  about 7.7% and 8.5% and decreases the ISFC by about 7.5% at part load and  increases power and IMEP by 8.5%, 8.5% and decreases ISFC by 8% at full load  condition, respectively. Using this method, it was possible to control  emissions formation and increase performance parameters simultaneously. The  predicted results for mean in-cylinder pressure and emissions are compared to  the corresponding experimental results and show good agreements.