J0801-3-4 ロングストローク化による火花点火ガスエンジンの熱効率改善特性([J0801-3]エンジン,動力システムにおける燃焼技術(3))

概要

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Improvement of thermal efficiency in a spark ignition gas engine with longer strokes was investigated with two engines with stroke / bore ratios of 1.0 and 1.5 and the similar stroke volumes. The indicated thermal efficiency improved significantly with longer strokes mainly due to reductions in cooling loss over wide operation ranges while the degree of improvements decreased slightly in comparison with another longer stroke case under the same bore with increasing stroke volumes reported previously. The degree of improvement in thermal efficiency with longer strokes was more significant under the lean range than the stoichiometric range but the combustion stability deteriorated when the excess air ratio exceeded 1.5 and the lean limit was richer. The indicated thermal efficiency improved over the wide range of the indicated mean effective pressures with longer strokes due to reductions in cooling loss.
2010-09-04