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    • Numerical Simulation Study on Combustion and Emission Characteristics of Hydrogen Fueled Natural Gas Homogeneous Charge Compression Ignition Engines
    DOI：10.13949/j.cnki.nrjgc.2022.06.004
    Key Words:hydrogen enriched natural gas  internal combustion engine  homogeneous charge compression ignition（HCCI）  chemical reaction kinetics
    Author NameAffiliationE-mail
    LI Yanji* Clean Energy Key Laboratory of Liaoning， Shenyang Aerospace University， Shenyang 110136， China yanji0518@163.com 
    XU Duo Clean Energy Key Laboratory of Liaoning， Shenyang Aerospace University， Shenyang 110136， China  
    SONG Ruiwen Clean Energy Key Laboratory of Liaoning， Shenyang Aerospace University， Shenyang 110136， China  
    LI Mingze Clean Energy Key Laboratory of Liaoning， Shenyang Aerospace University， Shenyang 110136， China  
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    Abstract:In order to investigate the effects of hydrogen enrichment on the combustion and emission formation processes of natural gas homogeneous charge compression ignition（HCCI） engines， based on the chemical kinetics software of CHEMKIN， a single-zone model was used to calculate the in-cylinder processes of natural gas HCCI engine fueled with different hydrogen fractions （from 0% to 40% in volumetric fraction）. The numerical results show that the trend of change in the in-cylinder temperature and heat release rate after adding hydrogen shows a slight decrease at first and then an increase. However， the effect of adding hydrogen on the in-cylinder pressure is not obvious. And the increase in the ratio of hydrogen incorporation leads to an earlier ignition time. As the hydrogen doping ratio increases， the mole fractions of CO and CO2 decrease while the mole fraction of NO shows an opposite trend. A large amount of H is supplied to the system after adding hydrogen， which accelerates the chain branching and chain transfer reactions. And the generation rates of HO2 and OH are accelerated， resulting in an earlier ignition time. The total formation rate of NO increases with the increase of hydrogen doping ratio.
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