喷油角度对低速二冲程船用柴油机燃烧的影响  

Effect of the fuel injection angle on the combustion of a low-speed two-stroke marine diesel engine

作　　者：王怀印 孙凯[1] 刘腾 王晨 鲁祯[1] 王天友[1] WANG Huaiyin;SUN Kai;LIU Teng;WANG Chen;LU Zhen;WANG Tianyou(State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China;China Shipbuilding Power Engineering Institute Co.,Ltd.,Shanghai 201206,China)

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072 [2]中船动力研究院有限公司,上海201206

出　　处：《哈尔滨工程大学学报》2020年第1期139-144,共6页Journal of Harbin Engineering University

基　　金：工业和信息化部高技术船舶科研项目(CDGC01-KT0105);国家杰出青年科学基金项目(51525603);国家自然科学基金项目(51506142)

摘　　要：针对低速二冲程船用柴油机燃烧过程中复杂的油气混合问题,本文采用CFD软件CONVERGE研究了喷油角度对某低速二冲程柴油机混合气形成、燃烧和排放的影响,并给出了喷油角度优化策略。结果显示:顺涡流方向调整喷油角度降NOx潜力较大,当喷油角度α=23°时,NOx排放相比原机降低了22.1%;通过综合调整涡流方向和垂直方向喷油角度,优化了发动机NO x排放和BSFC的综合表现,(α=13°,β=22°)喷射角度可实现较低的NO x排放;无EGR时得到的燃油喷射角度优化策略,在EGR氛围下同样适用。To investigate the fuel-air mixing problem in the combustion process,the effect of injection angle on the formation,combustion,and emission characteristics of fuel air mixture of a low-speed two-stroke marine diesel engine was numerically studied using a three-dimensional CFD software CONVERGE,and the optimizing strategy of the injection angle was obtained.The results show that the potential of NO x emission reduction is larger by adjusting the injection angle along the swirl direction.The NO x emission decreased by 22.1%compared with that of original engine when the injection angle was 23°.The general performance of the engine NO x emission and BSFC can be further optimized by comprehensively adjusting the injection angles along both swirl and vertical directions,and the injection angles(α=13°,β=22°)can realize lower NO x emission reduction without deteriorating the fuel consumption rate.Furthermore,the optimizing strategies of fuel injection angle obtained without EGR are also applicable in EGR atmosphere.

关 键 词：二冲程船用柴油机 燃烧 排放 喷油角度 涡流 油气混合 燃油蒸发 EGR率 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]