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    • Experimental Study on Cold Start of A Low Pressure Air Assisted Injection Methanol Engine
    DOI：10.13949/j.cnki.nrjgc.2023.02.009
    Key Words:low pressure air assisted injection  methanol engine  cold start  spray particle size
    Author NameAffiliationE-mail
    HU Chunming* Internal Combustion Engine Research Institute， Tianjin University， Tianjin 300072， China
    School of Mechanical Engineering， Tianjin University， Tianjin 300072， China     		cmhu@tju.edu.cn 
    MA Jianyi School of Mechanical Engineering， Tianjin University， Tianjin 300072， China  
    HE Yonghui School of Mechanical Engineering， Tianjin University， Tianjin 300072， China  
    LIU Na Internal Combustion Engine Research Institute， Tianjin University， Tianjin 300072， China  
    SONG Xijuan Internal Combustion Engine Research Institute， Tianjin University， Tianjin 300072， China  
    DU Chunyuan Internal Combustion Engine Research Institute， Tianjin University， Tianjin 300072， China  
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    Abstract:In view of the difficulty in cold start of a methanol engine caused by the difficulty in forming a mixture with appropriate concentration， a single-cylinder methanol engine with the self-developed air assisted port injection system（AAPI） was taken as the research object to carry out experimental research. Without auxiliary measures， the effects and law of high methanol atomization through AAPI on the cold start of a methanol engine were explored. Results show that AAPI obviously speeds up the formation rate of combustible mixture before the cold start of the methanol engine. The average change rate and the peak change rate of excess air coefficient λ before starting of the methanol engine with AAPI were 3.2 times and 2.26 times those of the methanol engine with port fuel injection， respectively. The ignition time has a great influence on the cold start of the methanol engine with AAPI. Therefore， to optimize the cold start performance of the methanol engine with AAPI， it is necessary to select an appropriate ignition time.And the optimum ignition time is 20° before the dead center in the test conditions. The ambient temperature also has a great influence on the cold start performance of the methanol engine with AAPI. With the decrease of the ambient temperature， the cold start time gets longer. And the methanol engine with AAPI can realize reliable cold start at 5 ℃.
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