| At present, the researches on diesel engine emission reduction-technology mostly focus on inside treatment and after-treatment technology, with less attention on the diesel combustion mechanism. In this thesis, the free radical reaction mechanism in diesel oil combustion was systematically studied, the formation and stabilization of free radical was discused. Through introducing UV-irradiation and photoinitiators as benzophenone and benzoin, the diesel oil combustion was effected and the diesel exhaust was improved, which makes a new mind on the removal of diesel emission. The main works in this paper are as follows:Firstly, the combustion producer system-blowtorch was designed, the species of photoinitiators was ascertained and the analysis method of THC(Total Hydrocarbon Compound) was established. The experimental results showed that the relative error of system was at±6%, the optimum dose of diesel and gasoline additive were 2‰and 6‰, with the THC removal efficiency were 85% and 95% relatively.Secondly, based on the capillary siphoning, a more suitable combustion system was designed to research on the UV-irradiation and photoinitiators effects on combustion process, and the formula to calculate the THC removal efficiency(ηTHC) was set up. The relative error of this system was at±0.5%, the sampling time was at 5min after ignition. The study indicated that:compared sunlight with UV-irradiation, the optimum dose of diesel additive was 6‰withηTHC up to 72% and 81%, the optimum dose of benzophenone was 3‰withηTHC at 41% and 62%, the optimum dose of benzoin was 4×10-3 and 1×10-4 withηTHC relatively at 55% and 58%.Finally, the high sensitive and efficient analysis method was studied to analyze the organic compounds in the diesel exhaust particle matters (PM) with the thermal desorption and GC-MS. By analyzing PM compounds, some initial researches about the effects of UV-irradiation and photoinitiators on combustion mechanism has been explored in the thesis.
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