Effect of Ethanol on Knock in Spark Ignition Gasoline Engines

Kenjiro Nakama, Jin Kusaka, Yasuhiro Daisho

研究成果: Conference article査読

5 被引用数 (Scopus)


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 92008 9月 11

ASJC Scopus subject areas

  • 自動車工学
  • 安全性、リスク、信頼性、品質管理
  • 汚染
  • 産業および生産工学


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