汽车工程学报2024，Vol.14Issue(6)：1036-1047,12.DOI:10.3969/j.issn.2095‒1469.2024.06.11
高压缩比点燃式发动机甲醇/PODE燃烧特征研究
Study on Combustion of Methanol/PODE in High Compression Ratio Spark-Ignition Engines
摘要
Abstract
In methanol engines,mixed-gas compression ignition can be achieved by increasing the compression ratio,using spark ignition,and adopting polyoxymethylene dimethyl ethers(PODE)as the active improved fuel.This approach overcomes the limitations imposed by flame propagation speed on thermal efficiency.Experiments were conducted to investigate and compare the combustion characteristics,thermal efficiency and emission properties of dual-fuel spark-assisted compression ignition(SACI)mode and single-fuel methanol ignition at different loads and engine speeds.The main conclusions are as follows:the effect of dual-fuel SACI on thermal efficiency varies with the load range.At a BMEP of 0.8 MPa,the thermal efficiency reaches 41.9%,an increase of 1.9% compared to methanol ignition.However,at BMEP levels below 0.4 MPa,the cyclic variability is higher and the thermal efficiency is lower than that of methanol ignition.Dual-fuel SACI reduces NOx emissions,achieving a 79% reduction compared to methanol ignition at a BMEP of 0.8 MPa.Increasing RPM accelerates PODE diffusion,aiding the formation of the initial combustible mixture,decreasing the proportion of compression ignition in combustion,and enhancing the proportion of flame propagation ignition.At low loads,HC emissions decrease with higher RPM.However,high RPM reduces the compression ignition ratio and increases NOx emissions.Low RPM and high load conditions are more favorable for efficiency and emissions.These findings provide valuable support for the application of methanol engines.关键词
PODE/甲醇/双燃料/火花辅助压燃Key words
PODE/methanol/dual-fuel/spark-assisted compression ignition分类
能源科技引用本文复制引用
刘宇,朱天奎,吕钊,乔信起,黄震..高压缩比点燃式发动机甲醇/PODE燃烧特征研究[J].汽车工程学报,2024,14(6):1036-1047,12.基金项目
国家重点研发计划政府间国际科技创新合作重点专项(2017YFE0130800) （2017YFE0130800）
