A Study of low Compression Ratio DME Engines Operated with Close Stoichiometric Working Gas and Pre-injection
A pre-injection at around 3％ is not effective to reduce the NO<,x> emission of DME diesel engines but there is no deterioration of engine performance and engine noise. Furthermore, the 3％ pre-injection enables the same brake thermal efficiency at decreased compression ratio of 16.12 as compared with those of original compression ratio of 17.7. On the other hand, the NO<,x> reduction caused by decreased compression ratio with pre-injection is lower than that of same compression ratio with single injection method. The usage of feature of DME, namely no-soot combustion at high rate of EGR, NO<,x> emission of excess air factor at 1.05 shows a low level of post new term regulation of Japan and close upon the US10 regulation without any deterioration of brake thermal efficiency and after treatment device of exhaust emissions.
Dimethyl Ether (DME) C. L engine Compression ratio Pre-injection Close stoichiometric combustion EGR NO<,x>
Shuichi Kajitani Atsushi Hoshimiya Mitsuhide Hayashi Masaaki Kato
Ibaraki University, Nakanarusawa 4-12-1, Hitachi, lbaraki, Japan 316-8511 Graduate school of Ibaraki University, Nakanarusawa 4-12-1, Hitachi, lbaraki, Japan 316-8511 DENSO Corp. Nakanarusawa 4-12-1, Hitachi, lbaraki, Japan 316-8511
国际会议
2007年(中国内燃机学会第六届学术年会暨国际内燃机学术研讨会和第六届中国国际内燃机及制造装备展览会)两会一展国际学术会议
上海
英文
253-259
2007-10-09（万方平台首次上网日期，不代表论文的发表时间）