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SAE 2008-32-0020 : 2008

Effect of Ethanol on Knock in Spark Ignition Gasoline Engines

Standard Details

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.

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General Information

Status : ACTIVE
Standard Type: Main
Document No: SAE 2008-32-0020 : 2008
Document Year: 2008

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SAE 2008-32-0020 : 2008
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