This study examines the effects of ethanol content on engine performances and the knock characteristics in spark ignition gasoline engine under various compression ratio conditions by cylinder pressure analysis, visualization and numerical simulation. The results confirm that increasing the ethanol content provides for greater engine torque and thermal efficiency as a result of the improvement of knock tolerance. It was also confirmed that increasing the compression ratio together with increasing ethanol content is effective to overcome the shortcomings of poor fuel economy caused by the low calorific value of ethanol. Further, the results of one dimensional flame propagation simulation show that ethanol content increase laminar burning velocity. Moreover, the results of visualization by using a bore scope demonstrate that ethanol affects the increase of initial flame propagation speed and thus helps suppress knock.
|ジャーナル||SAE Technical Papers|
|出版ステータス||Published - 2008 1月 1|
|イベント||SAE Small Engine Technology Conference and Exposition, SETC 2008 - Milwaukee, United States|
継続期間: 2008 9月 9 → 2008 9月 11
ASJC Scopus subject areas