Construction of Chemical Kinetics Mechanism of Aldehydes Unregulated Pollutants from Diesel Engines
Based on combustion mechanisms of five fuels with different properties,the reaction path analysis method was used to analyze the generation of formaldehyde and acetaldehyde from a diesel engine.A chemical ki-netics mechanism of aldehydes unregulated pollutants(aldehydes mechanism)containing 43 species and 63 reac-tions was constructed,and the predicted value of this mechanism was compared with the experimental value.The results show that the mechanism can not only predict the ignition delay time,the laminar flame speed and the gen-eration of important species in a wide range of equivalence ratio,but also accurately predict the emissions of for-maldehyde and acetaldehyde in the diesel engine.The emissions of formaldehyde and acetaldehyde can be effec-tively reduced by increasing the intake temperature and pressure,advancing the injection time,and shortening the injection duration.However,increasing exhaust gas recirculation(EGR)rate will lead to a significant increase in both emissions.Among them,the most influential factor on formaldehyde emissions is the injection advance angle,and EGR rate is the most influential factor on acetaldehyde emissions.
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维普
