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    • Effects of Different Intake Atmosphere Coupled with Exhaust Gas Recirculation on the Working Process of Dual Fuel Engines
    DOI：10.13949/j.cnki.nrjgc.2022.02.001
    Key Words:dual-fuel engine  intake atmosphere  exhaust gas recirculation  combustion  emission
    Author NameAffiliationE-mail
    CHEN Guisheng* Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China cgs_yly@163.com 
    WEI Feng Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China  
    LI Bing Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China  
    WANG Zhenjiang Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China  
    HUANG Zhen* Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China 1329627964@qq.com 
    LUO Ying 31638 Troops of the PLA， Kunming 650051， China  
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    Abstract:The effects of different intake atmosphere（H2， O2 composition） coupled with exhaust gas recirculation（EGR） on the mechanism of working process of natural gas/diesel dual fuel engine at low loads were studied based on three-dimensional computational fluid dynamics（CFD） simulation model， coupled with the simplified chemical kinetic mechanism of n-heptane/methane/ethane/propane multi-component mixture.Results show that under different EGR rates， the combustion rate in the cylinder and the concentration of OH active radical are increased significantly， and CH4 emissions are reduced significantly. But CO emissions are increased when H2 is added into the intake charge. Under different EGR rates， the peaks of cylinder pressure and instantaneous heat release rate， the maximum pressure rise rate， the maximum combustion temperature and the concentration of OH active radical are increased when O2 is added into the intake charge. At the same time， the post-oxidation of soot， CO and CH4 emissions are enhanced， so that the final emissions of soot， CO and CH4 are reduced， while NOx emissions are increased. CH4 emissions and the ratio of NO2 to NOx are significantly reduced while lower CO and soot emissions are achieved when the EGR rate is less than 29% and the volume mixing ratio of H2 is less than 2.5%. Adding O2 into the intake charge can reduce CO and soot emissions and improve the trade-off relationship between CH4 and NOx emissions.
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