The main pollutant of diesel engine exhaust is introduced,and its formation mechanism is also presented.On the base,the ways of reducing emission,including in-engine combustion process and in-engine exhaust,especially about electronically control technical,Selective Catalytic Reduction Method(SCR),Diesel Particulate Filter(PDF),are indicated.At last,the prospect for diesel engine emission control way is showed,and it was discussed that diesel engine emission control way is applied in China.
Automaticlight oilburning machines areimportant in oil combustion and utilization. The article introducedthe configuration and
technological characteristics of automatic light oil burning machines, and normal design methods of combustion head, oil system, air system
and control system. To design for automatic light oil burning machine it is analysis.
This paper investigated the effects of several key factors in natural gas engines on knock trend.Firstly,both autoignition and two step turbulent combustion submodels were coupled to multidimensional model code(KIVA-3V) used in the calculation of in-cylinder flow dynamics for engines.Then, multidimensional model was modified by combining numerical calculation with experiments.Thirdly,the computing knock of engines was simulated after adjusting the operating conditions.Finally,the effects of such factors as ignition timing,compression ratio,swirl ratio and equivalence ratio on the knock occurrence crank angle(KOCA) and knock intensity(KI) were analyzed.The results are shown as followings: KI declines obviously as compression ratio does;KOCA occurs early and KI increases with the adding of ignition timing;KI rises and KOCA occurs early while the equivalence ratio changes from 0.72 to 0.78,but KI rises and KOCA occurs latterly while it does from 0.78 to 0.92 and KOCA happens early as swirl ratio is adjusted from 0.0 to 2.0,but it does latterly as swirl ratio changes from 2.0 to 3.11.It is concluded that the effect of compression ratio on KOCA and KI is the most sensitive,equivalence ratio second,ignition timing and swirl ratio the least.
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