摘要
为了解决均质压燃(HCCI)发动机运行范围过窄的问题,在一台HCCI发动机上增加了外部废气再循环(EGR)装置,通过改变EGR率、进气温度及混合气浓度等参数,研究了外部EGR在不同工况下对甲醇HCCI发动机性能和运行范围的影响。结果表明:外部EGR可使甲醇HCCI燃烧向更浓的混合气方向拓展,使发动机的最大平均指示压力由无EGR时的0.37MPa增加到0.50MPa,增加了35.14%;平均指示压力的覆盖范围可通过外部EGR得到有效拓宽,在EGR率为12%～15%时达到最大,约有0.22MPa的变动幅度。
In order to solve the problem that the operation range of homogeneous charge compression ignition（HCCI） is too narrow,an external exhaust gas recirculation（EGR） system was installed on the HCCI engine.By adjusting EGR ratio,intake charge temperature and mixture concentration,the impacts of external EGR on methanol HCCI engine performance and operation range were investigated under different operation conditions.The results show that EGR does have remarkable influence on performance and operation range.External EGR can extend the mixture concentration toward richer mixture.The indicated mean pressure is increased by 35.14%,from 0.37 MPa without EGR in 0.50 MPa with EGR.Also,the indicated mean pressure range is effectively extended and the maximum changeable range,about 0.22 MPa,is obtained when EGR ratio keeps between 12% and 15%.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第5期102-106,共5页
Journal of Chang’an University(Natural Science Edition)
基金
陕西省自然科学基础研究计划项目(2012JQ7031)
关键词
汽车工程
内燃机
均质压燃
甲醇
废气再循环
性能
运行范围
automobile engineering
internal combustion engine
HCCI
methanol
EGR
performance
operation range
