掺混PODE_(n)对双燃料发动机燃烧特性的影响  

Effects of Blending PODE_(n) on the Combustion Characteristics of Dual-Fuel Engine

作　　者：任烁今 张明 郭勇[1] 颜燕[1] 王志[2] 王建昕[2] Ren Shuojin;Zhang Ming;Guo Yong;Yan Yan;Wang Zhi;Wang Jianxin(China Automotive Technology and Research Center Co.,Ltd,Tianjin 300300,China;State Key Laboratory of Automotive Safety and Energy,Tsinghua University,Beijing 100084,China)

机构地区：[1]中国汽车技术研究中心有限公司,天津300300 [2]清华大学汽车安全与节能国家重点实验室,北京100084

出　　处：《燃烧科学与技术》2021年第3期289-296,共8页Journal of Combustion Science and Technology

基　　金：天津检验中心共性基础技术研究资助项目(TJKY2022003).

摘　　要：聚甲氧基二甲醚(PODEn)是一种潜力巨大的新型无毒替代燃料.本文在一台重型多缸发动机上开展了柴油掺混PODEn对汽柴油双燃料燃烧与排放特性影响的试验研究,并采用计算流体力学(CFD)三维仿真模拟对燃烧过程及影响机理进行了分析.PODEn占直喷燃油的体积分数选为0、10%和20%.试验结果表明,随着PODEn掺混比例的升高,直喷燃料的十六烷值上升,导致燃烧相位前移,滞燃期缩短,燃烧效率有所升高,NOx排放稍有增加,而碳烟、THC和CO排放则明显下降.模拟结果表明,随着PODEn比例的升高,NOx排放随着缸内高温燃烧区域以及燃料含氧量的增加而稍有增加,而对碳烟、THC和CO排放的氧化速率升高.Polyoxymethylene dimethyl ether(PODEn)is a promising non-toxic alternative fuel for diesel engines.Experiments were conducted on a heavy-duty multi-cylinder engine to study the effects of blending PODEn on gasoline-diesel dual-fuel combustion.Three-dimensional computational fluid dynamic(CFD)simulations were also performed to analyze the combustion process.The ratios of PODEn in diesel fuel were chosen to be 0,10%and 20%,respectively.The experimental results show that as the PODEn ratio increased,the cetane number of the direct-injection fuel increased.As a result,the combustion phase became closer to the top dead center,the ignition delay time decreased and the combustion efficiency increased slightly.The NOx emissions increased while the soot,THC and CO emissions were reduced.The simulation results show that the NOx emissions increase as the incylinder high-temperature region becomes larger due to the increasing PODEn ratio.The oxidation rates of soot,THC and CO emissions also increase.

关 键 词：聚甲氧基二甲醚 双燃料 模拟 重型多缸机 替代燃料 

分 类 号：TK428.9[动力工程及工程热物理—动力机械及工程]