米勒循环发动机进气道优化设计  

Intake Port Optimization Design of the Miller Cycle Engine

作　　者：周正群 韦善景 刘伟达 李露露 李坚 李红双 Zhou Zheng-qun;Wei Shan-jing;Liu Wei-da;Li Lu-lu;Li Jian;Li Hong-shuang(SAIC-GM-Wuling Automobile Co.,Ltd,Guangxi Liuzhou 545007)

机构地区：[1]上汽通用五菱汽车股份有限公司,广西柳州545007

出　　处：《内燃机与配件》2023年第4期19-23,共5页Internal Combustion Engine & Parts

摘　　要：为了满足越来越严格的油耗法规要求,对某增压发动机进行米勒循环改造,通过利用CFD手段进行了三种进气道方案设计对比分析,并进行样机试验对比,结果表明:进气道滚流比的提升,可以大大增强缸内气流湍流强度,加快缸内燃烧扩散速度,燃烧速率较奥托循环气道提升22.2%。相比奥托循环,米勒循环外特性最大扭矩下降6%,额定功率下降2%,但米勒循环对发动机外特性的油耗降幅非常可观,低速工况降幅达到4%,高速工况降幅达到14.6%。In order to meet the increasingly stringent requirements of fuel consumption regulations, Miller cycle modification was carried out for a turbocharged engine, CFD method has been carried on the comparative analysis of the three intake port designs, and Prototype manufacturing test, the results show that the promotion of the flow tumble ratio of intake port can greatly enhance the in cylinder flow turbulence intensity, speed up the diffusion combustion in cylinder by 22.2%. ?Compared with Aoto Cycle, the maximum torque of Miller’s WOT characteristics is reduced by 6%, and the rated power is reduced by 2%. The fuel consumption of Miller Cycle engine is reduced by 4% at low speed condition and 14.6% at high speed condition.

关 键 词：米勒循环 气道设计 流体仿真 滚流比 燃烧性能 

分 类 号：U464[机械工程—车辆工程]