摘要
针对二冲程点燃式进气管电喷煤油发动机存在的缸间进气差异进行CFD数值模拟,利用GT-power、Fluent搭建了原型机一维仿真模型及三维仿真模型,建立了曲轴箱搅动区域和气缸扫气区域,分别对2部分流场域的气体流动过程进行分析。结果表明:进入左缸扫气道的新鲜混合气充量和煤油质量分别为102.27 mg和16.59 mg,进入右缸扫气道的新鲜混合气充量和煤油质量分别为107.03 mg和21.01 mg,曲轴箱分配不均匀度为2.27%,气缸扫气差异度为1.6%,整机的进气不均匀度为1.48%;受到曲轴搅动的影响进入右缸的混合气质量和浓度更大,所以影响整机进气不均匀的关键是曲轴箱分配不均匀,研究发现更小的喷油粒径不仅能提升扫气效率,也能够优化两缸进气的缸间差异。
To achieve CFD numerical simulation of the intake difference between cylinders in the two-stroke ignition intake pipe EFI kerosene engine,Fluent builds a one-dimensional simulation model and a three-dimensional simulation model of the prototype by GT-power.By setting up the crankcase agitation area and the cylinder scavenging area,this paper analyzes the gas flow process in the flow field of the two parts.The results show the fresh charge and kerosene mass entering the left cylinder scavenging channel reach 102.27 mg and 16.59 mg respectively whereas the fresh charge and kerosene mass entering the right cylinder scavenging channel stand at 107.03 mg and 21.01 mg respectively.The unevenness of crankcase distribution is 2.27%,of air intake of the whole machine is 1.48%while the difference of cylinder scavenging is 1.6%.In conclusion,the crankshaft agitation causes larger mixture mass and concentration into the right cylinder and therefore the uneven distribution of the crankcase is largely responsible for affecting the uneven intake of the whole machine.It is also found that the smaller-sized injection particles not only improve the scavenging efficiency,but also optimize the difference between the two cylinders.
作者
黄盟
曹广州
魏民祥
杨浩鹏
赵卓文
HUANG Meng;CAO Guangzhou;WEI Minxiang;YANG Haopeng;ZHAO Zhuowen(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Drone Research Institute,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《重庆理工大学学报(自然科学)》
北大核心
2023年第11期113-124,共12页
Journal of Chongqing University of Technology:Natural Science
基金
中央高校基本科研业务费项目(56XCA2205403)。
关键词
二冲程发动机
进气管电喷
进气差异
数值模拟
煤油
two-stroke engine
intake pipe EFI
air intake difference
numerical simulation
kerosene
