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    • Effects of CO2/O2 Environment on Ignition and Combustion Characteristics of Diesel
    DOI：10.13949/j.cnki.nrjgc.2023.03.006
    Key Words:CO2/O2 environment  constant volume combustion chamber  ignition process  nature flame luminosity  the third body effect
    Author NameAffiliationE-mail
    WAN Yuan* School of Mechanical-Electronic and Vehicle Engineering， Beijing University of Civil Engineering and Architecture， Beijing 102627， China wanyuan0321@foxmail.com 
    LIU Yongfeng* School of Mechanical-Electronic and Vehicle Engineering， Beijing University of Civil Engineering and Architecture， Beijing 102627， China liuyongfeng@bucea.edu.cn 
    BI Guijun Singapore Institute of Manufacturing Technology， A*Star， Singapore 637662， Singapore  
    LIU Haifeng State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China  
    ZHANG Lu School of Mechanical-Electronic and Vehicle Engineering， Beijing University of Civil Engineering and Architecture， Beijing 102627， China  
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    Abstract:In order to investigate the effect of CO2/O2 environment on the ignition and combustion characteristics of diesel fuel， using n-heptane as the diesel surrogate fuel， the ignition and combustion process of n-heptane under different CO2/O2 environments were calculated based on the computational fluid dynamics software CONVERGE. The optical constant volume combustion chamber was established to validate the model， and the nature flame luminosity of n-heptane combustion was recorded by high-speed camera. The initial temperature was 850 K， the initial pressure was 3 MPa， and the CO2 volume fractions were 35%， 40%， 50% and 60%. The reaction path of important radicals was calculated by the closed homogeneous reactor in CHEMKIN to analyze the physical and chemical effect of CO2 on ignition. The results show that， deflagration exists at 35% CO2 volume fraction. As the CO2 volume fraction increases， the ignition delay time increases， the ignition position is further away from the nozzle， and length and width of the steady-state flame also increases. The peak intensity of nature flame luminosity decreases significantly when the CO2 volume fraction is between 50% and 60%. The physical effect of CO2 suppresses the ignition， and the chemical effect of CO2 promotes the ignition due to the promotion of ignition by third body effect than the inhibition of ignition by direct chemical effect， and the chemical effect is strengthened with the increase of CO2 volume fraction.
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