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燃焼室因子の影響

概要

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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 used to obtain the data for practical application. Investigated were the effects of the throat area of the orifice which separated a prechamber from a main chamber, the position of ignition spark in the prechamber and the compression ratio on the thermal efficiency, the exhaust emissions and the lean limit of stable operation. The results showed that a small throat area resulted in low emissions of NO_x, low thermal efficiency and narrow lean limit. The spark ignition at the center of prechamber or near the throat was preferable to the top of prechamber in terms of the thermal efficiency. Higher compression ratio resulted in shorter combustion duration, higher thermal efficiency and extended lean limit.
一般社団法人日本機械学会の論文
1998-05-25