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    • Analysis of Combustion and Emission Characteristics of Methanol/Gasoline Fuels in a Direct Injection Miller Cycle Gasoline Engine
    DOI：10.13949/j.cnki.nrjgc.2024.05.008
    Key Words:gasoline direct injection engine  compression ratio  Miller cycle  methanol  particle size distribution
    Author NameAffiliationE-mail
    TAN Xin School of Intelligent Manufacturing and Industrial Safety， Chongqing Institute of Safety &
    Technology， Chongqing 404100， China     		25075377@qq.com 
    LIU Zongfa School of Automotive Engineering， Weifang Vocational College， Weifang 262737， China liuzongfa@sdwfvc.cn 
    XIA Ming* School of Intelligent Manufacturing and Industrial Safety， Chongqing Institute of Safety &
    Technology， Chongqing 404100， China     		550622470@qq.com 
    LI Liang Chongqing Selis New Energy Vehicle Design Institute， Selis Group Co.， Ltd.， Chongqing 401135， China liang.li45479@seres.cn 
    TAN Hu Yubei Factory， Chongqing Chang’an Automobile Co.， Ltd.， Chongqing 400023， China 362308883@qq.com 
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    Abstract:The thermal efficiency potential of high compression ratio Miller cycle engines and the effects of methanol and methanol/gasoline blended fuels on combustion processes and emission characteristics were studied. Through comparative experimental analysis， the thermal efficiencies of the Miller cycle versus the conventional Otto cycle under different compression ratios were investigated， along with the mechanisms by which methanol fuel affects engine combustion performance and emissions. Results indicate that， under high-speed and high-load conditions， the Miller cycle exhibits a higher thermal efficiency potential compared to the Otto cycle， also improving tolerance to higher compression ratios. In conditions selected for the experiments at 2 000 r/min， global indicated mean effective pressure （GIMEP） at 0.66 MPa， employing the Miller cycle at compression ratios of 11.5 and 14.5 respectively， it was found that the indicated thermal efficiency increased by approximately 0.6 and 0.8 percentage points relative to the Otto cycle. Utilizing methanol/gasoline fuel could advance the combustion phase without altering the load， aiding in further enhancing the engine’s indicated thermal efficiency level. When burning pure methanol， under heavy load conditions， the combustion process is significantly improved. Compared to gasoline fuel， the in-cylinder maximum pressure increased by about 30%， the indicated thermal efficiency increased by 7.2 percentage points， and NOx emissions rose significantly， with an increase of 80%. Moreover， when using methanol fuel， the number of nucleation mode particles significantly increased， while the number of accumulation mode particles decreased， with the peak values of different mode particles shifting towards smaller diameters.
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