Influence of EGR on Gas Emission and Particle Distribution of Diesel Engine Fueled with DMM-Diesel Blends
An experimental investigation of the influence of exhaust gas recirculation (EGR) ratio on combustion, performance and emissions of a compression-ignition engine fueled with dimethoxymethane (DMM)-diesel blends was conducted. The effects of DMM-diesel blends fueled diesel engine combined with EGR on the particle number and size distribution were also examined with the electrical low-pressure impactor (ELPI). The results indicated that NOx emission can be reduced remarkably with the increase of EGR ratio on the DMM-diesel blends fueled engine. However, smoke, CO and HC emissions increase with the increase of EGR ratio. Brake thermal efficiency shows fluctuation at small EGR ratio and a decreasing trend with further increase of EGR ratio. In comparison with diesel fuel, particle size and mass distribution for a diesel engine fueled with DMM-diesel blends is not affected significantly by EGR whereas the total number and mass increase for both fuels. DMM-diesel blend fueled engine has lower number of particles in the geometric mean diameter (GMD) diameter range of 0.0392-1.2393μm whereas relatively high number of particles at the lowest aerodynamic diameter measured of 0.0208μm compared with diesel fueled engine. The smoke opacity, the particulate number concentration increase with the rise of engine load, and which at 2200r/min are higher than those at 1600r/min. The study also showed that diesel-DMM blends combined with appropriate EGR ratio can realize a low-emission compression-ignition engine.
Yang Xiaofeng Zhu Ruijun Wang Xibin Huang Zuohua
Xian Jiaotong University
国际会议
天津
英文
1-13
2009-08-19（万方平台首次上网日期，不代表论文的发表时间）