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    • Combustion and Emissions of Di-N-Butyl Ether/Diesel Blend in a Single-Cylinder Diesel Engine
    DOI：10.13949/j.cnki.nrjgc.2022.04.001
    Key Words:di-n-butyl ether  diesel  fuel blend  engine  combustion  emission
    Author NameAffiliationE-mail
    REN Zhe* Key Laboratory for Power Machinery and Engineering of the Ministry of Education， Shanghai Jiao Tong University， Shanghai 200240， China zzz_ren@sjtu.edu.cn 
    LU Kangbo Key Laboratory for Power Machinery and Engineering of the Ministry of Education， Shanghai Jiao Tong University， Shanghai 200240， China  
    SUN Tao Key Laboratory for Power Machinery and Engineering of the Ministry of Education， Shanghai Jiao Tong University， Shanghai 200240， China  
    YANG Kai Key Laboratory for Power Machinery and Engineering of the Ministry of Education， Shanghai Jiao Tong University， Shanghai 200240， China  
    SHI Lei Key Laboratory for Power Machinery and Engineering of the Ministry of Education， Shanghai Jiao Tong University， Shanghai 200240， China  
    HAN Dong* Key Laboratory for Power Machinery and Engineering of the Ministry of Education， Shanghai Jiao Tong University， Shanghai 200240， China dong_han@sjtu.edu.cn 
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    Abstract:The combustion and emission characteristics of di-n-butyl ether（DnBE）/diesel blend were studied and compared to pure diesel fuel in a single-cylinder compression ignition engine. Engine operational parameters， including engine load， i.e. indicated mean effective pressure（IMEP）（0.55， 0.65 and 0.75 MPa）， the exhaust gas recirculation（EGR） rate （0%， 15% and 30%）， the fuel injection timing （-15°， -10°， -5° and 0° after top dead center）， and the volume fraction of di-n-butyl ether in the fuel blend （20% and 40% in volume） were adjusted to evaluate the engine performances of di-n-butyl ether/diesel blend under changed operation conditions. In comparison to pure diesel fuel， the fuel blends show an earlier pressure rising phase and advanced heat release process， which is more obvious under 30% EGR rate condition. Under all testing conditions， the lower premixed combustion fraction of di-n-butyl ether/diesel blend leads to a lower first-stage heat release peak than diesel fuel. Owing to its higher cetane number， the 40% DnBE/diesel blend features a shorter ignition delay time， a shorter combustion duration， and an earlier combustion centen than diesel fuel， implying a higher combustion rate. The experimental results manifest that the 40% DnBE/diesel blend has a more isovolumetric combustion progress， resulting in a higher indicated thermal efficiency（ITE） than that of pure diesel. Compared with diesel fuel， the nitrogen oxides（NOx） emissions and soot emissions of DnBE/diesel blend are lower， and the NOx emissions can be effectively reduced with the increased EGR rate and delayed injection timing. It is proved that the addition of DnBE can improve the trade-off relationship between NOx emissions， soot emissions， and indicated thermal efficiency in the diesel engine.
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