Predicting NOx Emissions of Diesel Engine Based on Fluent

The calculation model was carried out by use of commercially software Fluent. The distribution of temperature and NOx consistency field under different crank angle was calculated. The results of the analysis found that there was a greater temperature gradient near the cylinder wall. A larger temperature difference in the oil-beam external and internal and a high-temperature region formatted near the nozzle after the fuel spray and before the start of combustion. In the rapid combustion phase, combustion region was mainly focused on the oil-spray periphery. Post-combustion; the main combustion zone near the wall, Areas of high consistency for NOx was concentrated in high-temperature and oxygen-rich region. First, continue to increase, and then declined, and finally remains unchanged were the lows of the total NOx changing in cylinder.