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| Numerical Simulation of Effect of Biodiesel on Engine Combustion and Emissions with Post Injection |
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| Key Words:IC engine diesel soybean methyl ester multiple injection combustion characteristic emissions |
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| Abstract:An engine combustion model was built using AVL FIRE software, and the reduced mechanism of n-heptane-methyl decanoate-methyl-9-decanoate was used as the combustion kinetics mechanism of soybean methyl ester (SME)-diesel blended fuel to study the effect of SME and diesel blended in 30∶70 and 70∶30 (in volume) on the characteristics of combustion and emissions with single injection and main-post injection. The results show that, with the increase of SME content, the peak cylinder temperature is decreased. The combustion heat release is mainly affected by the dehydrogenation reaction rate of OH radical and fuel, and the reaction rate increases with a rise in temperature. NOxemission which is mainly affected by temperature decreases with the increase of the SME-diesel ratio. With the single injection mode, the greater the SME-diesel ratio is given, the lower the soot emission is produced. With the main-post injection mode, the production of soot decreases as the SME-diesel ratio rises because of the effect of C2H2; OH plays a dominating role in the process of soot oxidation, while the SME-diesel ratio does not matter much to the emission of soot. |
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