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    • Experimental Study on Combustion and Emission Characteristics of Polyoxymethylene Dimethyl Ethers（PODE）/Gasoline Dual-Fuel Spark Assisted Compression Ignition Engine
    DOI：10.13949/j.cnki.nrjgc.2022.06.005
    Key Words:spark assisted compression ignition  dual-fuel engine  polyoxymethylene dimethyl ethers（PODE）  gasoline  combustion  emission
    Author NameAffiliationE-mail
    ZHAO Tingyu* Key Laboratory for Power Machinery and Engineering of M.O.E.， Shanghai Jiao Tong University， Shanghai 200240， China zty1993@sjtu.edu.cn 
    XIA Chun Key Laboratory for Power Machinery and Engineering of M.O.E.， Shanghai Jiao Tong University， Shanghai 200240， China  
    FANG Junhua* Key Laboratory for Power Machinery and Engineering of M.O.E.， Shanghai Jiao Tong University， Shanghai 200240， China fjunhua@sjtu.edu.cn 
    HUANG Zhen Key Laboratory for Power Machinery and Engineering of M.O.E.， Shanghai Jiao Tong University， Shanghai 200240， China  
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    Abstract:A 4-cylinder gasoline direct injection（GDI） engine test bench was modified to work in spark assisted compression ignition combustion mode fueled with polyoxymethylene dimethyl ethers（PODE）and gasoline. The effects of direct injection（DI） strategy， spark timing and intake temperature on the performance of dual-fuel spark assisted compression ignition（SACI） engine were studied. The results show that there are three different SACI combustion modes according to the DI timing on 0.4 MPa at 1 600 r/min. The SACI combustion mode tends to homogeneous charge compression ignition（HCCI） combustion with the advance of DI timing. However， early DI timing will make fuels difficult to ignite and increase the proportion of incomplete combustion. The engine can achieve high thermal efficiency with low nitrogen oxide （NOx） and particle emissions on the HCCI combustion mode under steady combustion. The increasing intake temperature can significantly reduce the proportion of incomplete combustion and promote the autoignition of fuel， which makes the engine be able to run stably at earlier DI timing. The total hydrocarbon （THC） and carbon monoxide（CO） emissions are decreased with increasing intake temperature while the NOx emissions of low temperature combustion mode have a little change. The optimal thermal efficiency at 80 ℃ is 11.3% higher than that at 40 ℃ while the corresponding DI timing is 30° earlier. The advance of spark timing would promote combustion completely， which increases the thermal efficiency with low THC and CO emissions. The spark timing can control the combustion phase by changing the heat release process at the short interval between DI timing and spark timing. The effect of spark timing on combustion characteristics is weakened with advancing DI timing. Based on proper intake temperature and spark timing， the SACI engine fueled with PODE/gasoline can achieve highly efficient and clean combustion under HCCI combustion mode.
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