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    • Experimental Study on Combustion and Emissions of Spark-Assisted Compression Ignition of Polyxymethylene Dimethyl Ether/Gasoline Dual-Fuel
    DOI：10.13949/j.cnki.nrjgc.2024.03.002
    Key Words:dual fuel  spark-assisted compression ignition（SACI）  highcompression ratio  direct injection strategy  ignition strategy
    Author NameAffiliationE-mail
    YAN Xin College of Smart Energy， Shanghai Jiao Tong University， Shanghai 200240， China 318749170@sjtu.edu.cn 
    ZHU Tiankui Key Laboratory of Power Machinery and Engineering of the Ministry of Education， Shanghai Jiao Tong University， Shanghai 200240， China zhutiankui@sjtu.edu.cn 
    QIU Yuxiao Key Laboratory of Power Machinery and Engineering of the Ministry of Education， Shanghai Jiao Tong University， Shanghai 200240， China qiu_yx@sjtu.edu.cn 
    GUAN Bin* Key Laboratory of Power Machinery and Engineering of the Ministry of Education， Shanghai Jiao Tong University， Shanghai 200240， China guanbin@sjtu.edu.cn 
    HUANG Zhen College of Smart Energy， Shanghai Jiao Tong University， Shanghai 200240， China
    Key Laboratory of Power Machinery and Engineering of the Ministry of Education， Shanghai Jiao Tong University， Shanghai 200240， China     		z-huang@sjtu.edu.cn 
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    Abstract:The test platform was based on a modified gasoline direct injection（GDI） engine， with direct injection of polyoxymethylene dimethyl ether （PODE） in the engine cylinder， injection of gasoline in the intake tract， and an increase of the compression ratio from 10 to 15. The ignition and direct injection strategies were used as control parameters to get operating characteristics of the dual-fuel spark-assisted compression ignition （DF-SACI） engine. The test results show that the in-cylinder combustion shows multi-stage heat release， and advancing direct injection timing can improve the uniformity of the mixture， reduce the boundaries of different combustion stages and significantly increase the heat release rate（HRR）. The direct injection ratio can more effectively regulate the ratio of CA50 and iso-capacitive combustion， which has a significant impact on the thermal efficiency. The HRR is minimally affected by advancing the ignition timing. The maximum brake thermal efficiency in the test was 37.5%. In terms of emissions， the DF-SACI mode can reduce HC and CO emissions to a certain extent under the appropriate ignition and injection strategies， with the concentrations of HC reduced to below 3 000 ×10-6 and CO reduced to below 1 500×10-6， and keep NOx concentrations at a low level. Through the reasonable adjustment of the combustion strategies， the PODE/gasoline dual-fuel engine can realize efficient and clean combustion with the help of SACI.
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