A Shock-Tube Study on the Dependence of Base Fuels on Ethanol Ignition Suppression

Abstract

In order to chemically investigate the base fuel dependency of the ignition suppression effect of ethanol addition, shock-tube experiments and reaction simulation calculations were performed. Ignition delay measurements showed that the ignition suppression effect of ethanol was greatest for base fuels consisting only of paraffins, and this effect was weakened when 1-pentene and toluene were included. Computer simulations revealed that hydroperoxy radicals (HO₂) formed from ethanol abstracted hydrogen atoms at the allylic position of 1-pentene and at the benzylic position of toluene, resulting in an antagonistic effect on the ignition suppression of ethanol.