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    • An Optical Investigation on the Effects of Blending Strategies on Polyoxymethylene Dimethyl Ethers/Methanol Dual-Fuel Combustion
    DOI：10.13949/j.cnki.nrjgc.2024.03.003
    Key Words:optical engine  blending strategy  polyoxymethylene dimethyl ethers（PODE）  methanol  flame development  combustion stability
    Author NameAffiliationE-mail
    WANG Changtong Weichai Power Company Limited， Weifang 261000， China
    State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China     		15376365993@163.com 
    ZHANG Ren State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China 2017201325@tju.edu.cn 
    LI Wei Weichai Power Company Limited， Weifang 261000， China
    State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China     		liwei09@weichai.com 
    YANG Penghui State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China  
    PAN Jiaying* Weichai Power Company Limited， Weifang 261000， China
    State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China     		jypan@tju.edu.cn 
    WEI Haiqiao State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China whq@tju.edu.cn 
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    Abstract:Based on a single-cylinder optical engine， synchronization measurement of in-cylinder pressure and high-speed photography was performed， and the influences of different blending strategies on combustion and flame development characteristics of polyoxymethylene dimethyl ethers（PODE）/methanol dual-fuel mode was investigated. The blending strategies include P/M20 （methanol and PODE mixed in a volume ratio of 2∶8） fuel dual-injection mode and reactivity-controlled compression ignition（RCCI） mode that direct-injected PODE pilot ignites premixed methanol/air mixture. The results show that for the P/M20 fuel dual-injection mode， as the proportion of port-injection increases， the low-temperature heat release （LTHR） is enhanced， the ignition delay time（IDT） is shortened and the ignition timing is significantly advanced， further improving the combustion instability. For RCCI mode， as the methanol fraction increases， IDT is prolonged， the combustion phasing is delayed， peak pressure and heat release rate are decreased. Combustion visualizations show that under the two blending strategies， as the proportion of port-injection increases， the proportion of blue premixed flame increases， and the maximum flame propagation speed decreases. Due to the increase of the equivalence ratio of unburned mixture， the flame development gradually changes from obvious diffusion combustion to a sequential auto-ignition mode where new auto-ignition points continuously occur in the unburned mixture. Comparing the two blending strategies， it is shown that as the direct-injection timing is retarded， the combustion phasing can be optimized in some extent and the thermal efficiency can be improved. However， the two blending strategies have different focuses on combustion improvement. For P/M20 fuel dual-injection mode， increasing the port-injection ratio can enhance low-temperature heat release and promote auto-ignition， and then improve combustion instability. For RCCI mode， under the same port-injection ratio， the main combustion process is after the top dead center（TDC）， and the combustion phasing is closer to the optimal combustion phasing， which further reduces the heat transfer loss and negative circulating work. Therefore， the RCCI mode has higher indicated thermal efficiency and is more suitable for PODE/methanol dual-fuel combustion mode.
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