姚嘉伟,王谦,戴礼明,等.基于光学发动机的柴油/聚甲氧基二甲醚引燃乙醇对比研究[J].内燃机工程,2023,44(4):23-30.
基于光学发动机的柴油/聚甲氧基二甲醚引燃乙醇对比研究
Comparison Study of the Effects of Diesel/ Polyoxymethylene Dimethyl Ethers （PODE） on Pilot Ignition of Ethanol in An Optical Engine
DOI：10.13949/j.cnki.nrjgc.2023.04.004
关键词:反应活性控制压燃  聚甲氧基二甲醚  喷油策略  可视化
Key Words:reactivity controlled compression ignition（RCCI）  polyoxymethylene dimethyl ethers（PODE）  fuel injection strategy  visualization
基金项目:国家自然科学基金项目（51876083）
作者单位E-mail
姚嘉伟* 江苏大学 能源与动力工程学院，镇江212013 3324663539@qq.com 
王谦* 江苏大学 能源与动力工程学院，镇江212013 qwang@ujs.edu.cn 
戴礼明 江苏大学 能源与动力工程学院，镇江212013 457868542@qq.com 
钟汶君 江苏大学 能源与动力工程学院，镇江212013 398850164@qq.com 
姜鹏 江苏大学 能源与动力工程学院，镇江212013 329978982@qq.com 
蒋一 江苏大学 能源与动力工程学院，镇江212013 364413421@qq.com 
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摘要:为了改善内燃机燃烧与排放，探究反应活性控制压燃（reactivity controlled compression ignition， RCCI）燃烧规律，在一台轻型光学发动机上对比了缸内分别直喷柴油和聚甲氧基二甲醚（polyoxymethylene dimethyl ethers， PODE）引燃进气道喷射乙醇的燃烧特性。通过调节缸内直喷的喷油时刻和喷油比例，对燃烧过程进行了可视化试验分析。结果表明：随喷油时刻不断推迟，缸内燃烧压力与放热率呈现先增后减的趋势，喷油时刻在上止点前20°时燃烧效果最好。随着缸内直喷燃油比例的增加，每循环燃烧压力峰值和放热率峰值不断增加，燃烧相位提前，燃烧更充分。利用高速成像技术获得的图片结果显示：两种引燃模式下火焰均发生于近壁区域并向四周扩散。火焰亮度最高和面积最大的时刻出现在燃烧始点附近。PODE引燃乙醇时火焰场中无曝光区域而柴油引燃乙醇时存在较多曝光区。PODE/乙醇燃料组合相对于柴油/乙醇燃料组合的缸压和放热率峰值更高，滞燃期和燃烧持续期更短，燃烧效率更高，碳烟生成量更少。
Abstract:In order to improve the combustion and emissions of internal combustion engines， the combustion characteristics of reactivity controlled compression ignition（RCCI） were investigated on a light-duty optical engine. The combustion properties of direct-injected diesel fuel and polyoxymethylene dimethyl ethers（PODE） igniting ethanol which was injected into the intake manifold were compared. Visual experimental analysis of the combustion process was conducted by adjusting the timing and proportion of direct fuel injection into the cylinder. The results show that the combustion pressure and heat release rate increase first and then decrease as the injection timing is retarded. The best combustion performance was observed when the injection timing was 20° before the top dead center. When the proportion of direct-injected fuel in the cylinder is increased， both the peak combustion pressure and heat release rate per cycle increase continuously， and lead to an advance in the combustion phase and a more complete combustion. The images reveal that flames occur near the wall and then spread outward in both ignition modes. The highest flame brightness and largest flame area appears near the start of combustion. There is no exposure area in the flame field when PODE ignites ethanol， while there is more exposure when diesel ignites ethanol. Compared with diesel/ethanol， the PODE/ethanol has higher cylinder pressure and heat release rate peaks， shorter ignition delay and combustion duration， higher combustion efficiency， and lower soot formation.
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