NH_(3)-PODE_(3)双燃料发动机HCII燃烧特性的光学诊断  

Optical diagnostic on HCII combustion characteristics for NH_(3)-PODE_(3)dual fuel engine

作　　者：毛建树 马骁[1] 马跃[1] 王志[1] 张翼霄 帅石金[1] MAO Jianshu;MA Xiao;MA Yue;WANG Zhi;ZHANG Yixiao;SHUAI Shijin(State Key Laboratory of Automotive Safety and Energy,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学,汽车安全与节能国家重点实验室,中国北京100084

出　　处：《汽车安全与节能学报》2022年第3期509-516,共8页Journal of Automotive Safety and Energy

基　　金：国家自然科学基金项目(51976100);汽车安全与节能国家重点试验室基金项目(ZZ2021-034)。

摘　　要：氨和聚甲氧基二甲醚(PODE_(n))是内燃机实现双碳目标的重要替代燃料,而双燃料燃烧模式是一种公认较有潜力的氨燃烧技术路线。该文围绕PODE_(n)引燃NH_(3)的双燃料燃烧模式,基于光学发动机和高速摄影系统,研究了NH_(3)-PODE_(3)方案均质混合气引燃(HCII)模式中不同PODE_(3)喷射时刻及不同氨能量占比对缸内燃烧图像及燃烧特性的影响。结果表明:PODE_(3)具有良好的引燃特性;随着PODE_(3)喷射时刻从曲轴转角(CA)-20°延迟到-5°,火焰图像面积、火焰亮度和放热率峰值均增加,缸内压力峰值先增加后降低;直喷(DI)喷射时刻为CA-10°时,随着氨能量占比增加,CA10和CA50的相位逐渐滞后,但压力与放热率峰值均先增加后降低,说明存在最佳的氨-PODE_(3)能量比。Ammonia and PODE_(n)are important alternative fuels for internal combustion engines to achieve the dual carbon target,and the dual fuel combustion mode is a generally recognized potential technology route for ammonia combustion.Focusing on the dual fuel combustion mode of ammonia ignited by PODE_(n),the effects of different PODE_(3)injection times,the different ammonia energy fractions on the in-cylinder combustion images,and the combustion characteristics in the ammonia-PODE_(3)homogeneous charge induced ignition(HCII)mode were systematically investigated based on an optical engine and the high-speed photography system.The results showed that PODE_(3)has good ignition characteristics;with the PODE_(3)injection time being delayed from crank angle(CA)-20°to-5°,the flame image area,the flame brightness and the peak heat release rate are increasing while the peak in-cylinder pressure increases first and then decreases;At a fixed direct injection(DI)time of CA-10°,the phase of CA10 and CA50 are gradually retarded with the ammonia energy fractions increasing,while both of the peak pressure and the peak heat release rate in the cylinder increase first and then decrease,indicating that there is an optimal ammonia-PODE_(3)energy ratio.

关 键 词：内燃机 双燃料 氨(NH_(3)) 聚甲氧基二甲醚(PODE_(n)) 均质混合气引燃(HCII) 光学诊断 

分 类 号：TK448.21[动力工程及工程热物理—动力机械及工程]