The autoignition characteristics of methanol, ethanol and MTBE (methyl tert-butyl ether) have been investigated in a rapid compression machine at pressures in the range 20-40 atm and temperatures within 750-1000 K. All three oxygenated fuels tested show higher autoignition temperatures than paraffins, a trend consistent with the high octane number of these fuels. The autoignition delay time for methanol was slightly lower than predicted values using reported reaction mechanisms. However, the experimental and measured values for the activation energy are in very good agreement around 44 kcal/mol. The measured activation energy for ethanol autoignition is in good agreement with previous shock tube results (31 kcal/mol), although ignition times predicted by the shock tube correlation are a factor of three lower than the measured values. The measured activation energy for MTBE, 41.4 kcal/mol, was significantly higher than the value previously observed in shock tubes (28.1 kcal/mol). The onset of preignition, characterized by a slow energy release prior to early ignition was observed in some instances. Possible reasons for these ocurrences are discussed.
Autoignition of Alcohols and Ethers in a Rapid Compression Machine
Sae Technical Papers
International Fuels & Lubricants Meeting & Exposition ; 1993
1993-10-01
Conference paper
English
Ignition timing , Ethanol , Knock , Methanol
Autoignition of alcohols and ethers in a rapid compression machine
Automotive engineering | 1993
|Automotive engineering | 1990
|SAE Technical Papers | 2022
|British Library Conference Proceedings | 2022
|AUTOIGNITION OF BINARY FUEL BLENDS OF N-BUTANOL AND N-HEPTANE IN A RAPID COMPRESSION MACHINE
British Library Conference Proceedings | 2011
|