Abstract
Air contains oxygen, nitrogen, etc. The gas separated technology and mixed method could increase or decrease the certain components of air. Changing the concentration of the component has a great influence on soot formation of diesel engine. The influences of excess air coefficient and the oxygen, nitrogen proportion of inlet air, the initial temperature and the initial pressure on PAHs (the soot precursor) formation of diesel engine were discussed in this paper. The results showed that the coupling model of diesel PAHs could predict the reaction temperature, the concentration of the reaction intermediates (CO, CO2 and O2), and the ignition delay during the combustion progress accurately. The concentration of the soot and its precursor PAHs could be decreased effectively by changing the proportion of the oxygen and nitrogen in the inlet air. After increasing the excess air coefficient, the numbers of the reaction intermediate free radicals (H and OH) were increased and the concentration of aromatic hydrocarbons was decreased. The beginning angle of chemical reaction was advanced by increasing the initial temperature and pressure. And it is beneficial to decrease the concentration of PAHs.
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