火花点火式天然ガスエンジンの動力性能ならびに排気特性に及ぼすピストン形状および吸気流動の影響

概要

論文の詳細を見る
An experimental study was made on a natural gas fueled spark ignition engine to improve its thermal efficiency and exhaust emissions by the lean burn operation. A multi-cylinder engine was tested for purposes of practical application. Investigated were the effects of the piston design and the gas motion induced by a shrouded inlet valve on the combustion process, the thermal efficiency, exhaust emissions and the lean limit of stable operation. It was found that a bowl-in-piston resulted in higher thermal efficiency and extended lean limit as compared with a flat piston. A shrouded inlet valve generally resulted in shorter duration of combustion, lower NO_x emissions and lower thermal efficiency than a conventional valve. When a shrouded inlet valve was set so as to direct the mixture flow toward the prechamber throat, the lean limit was extended with low exhaust emissions and relatively high thermal efficiency.
一般社団法人日本機械学会の論文
1999-04-25