低压空气辅助缸内直喷汽油机进气道设计  

Intake Port Design for Low-pressure Air-assisted In-cylinder Direct Injection Gasoline Engine

作　　者：胡春明[1] 武珊[1] 詹樟松 于勇[1] 吕永[1] 张巍[1] 

机构地区：[1]天津大学内燃机研究所,天津300072 [2]重庆长安汽车股份有限公司,重庆400020

出　　处：《农业机械学报》2011年第11期15-18,26,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家高技术研究发展计划(863计划)资助项目(2008AA11A114);天津大学内燃机燃烧学国家重点实验室资助项目

摘　　要：以2.0 L四气门进气道喷射汽油机为样机,设计低压空气辅助缸内直喷汽油机,运用CFD仿真技术与气道稳流试验相结合对其进气道进行设计。建立了原进气道喷射汽油机进气道的三维仿真模型并进行计算和分析,表明气道流通能力不够强,有强滚流运动;气道内部三维流场分析结果说明部分区域存在气体滞留现象,通过气道稳流试验台对仿真结果进行了验证。根据低压空气辅助直喷汽油机对缸内气流运动特性的要求,在CFD仿真软件中对进气道结构进行了优化,通过调整气门杆附近的截面积、削弱滚流强度,提高了进气道的流通能力,同时改善了局部气流滞留现象。Taking a 2.0L four-valve port fuel injection gasoline engine as prototype,the low-pressure air-assisted direct injection gasoline engine and its intake ports were developed and optimized by using CFD simulation technology combined with steady flow test method.The 3-D simulation model of the intake port was built with CFD software,and calculation and analysis were carried out then.The calculation values were in a good agreement with the steady flow test results,and the data showed that the intake port provided low intake capacity and high tumble motion.Analysis of 3-D flow field showed that there was gas retention phenomenon in some areas.After structure optimization of the intake port with CFD software according to the requirements of air-flow motion characters inside the cylinder,the tumble motion was weakened by increasing the cross-sectional area nearby the valve stem to improve its intake capacity,which also reduced the gas retention phenomenon.

关 键 词：汽油机 缸内直接喷射技术 进气道 设计 

分 类 号：TK411.3[动力工程及工程热物理—动力机械及工程]