A. Farooq, D. Davidson, R. Hanson
Oct 15, 2014
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Abstract
Abstract High temperature pyrolysis of methyl propanoate (CH 3 CH 2 C( O)O CH 3 ) and ethyl propanoate (CH 3 CH 2 C( O)O CH 2 CH 3 ) was studied behind reflected shock waves at temperatures of 1250–1750 K and pressure of 1.5 atm. Species time-histories were recorded for CO, CO 2 , C 2 H 4 , and H 2 O using laser absorption methods over a test time of 1 ms. Pyrolysis of methyl propanoate (MP) appears to be faster than that of ethyl propanoate (EP) under the present experimental conditions, where CO and CO 2 reach their plateau values faster for MP at a specific temperature and fuel concentration. Higher plateau values are reached for CO in case of MP while the CO 2 levels are similar for the two ester fuels. Ethylene production is larger for EP due to the presence of six-centered ring elimination reaction that produces ethylene and propanoic acid. Very little H 2 O is produced during MP pyrolysis in contrast with appreciable H 2 O production from EP. Sensitivity and rate-of-production analyses were carried out to identify key reactions that affect the measured species profiles. Previous kinetic mechanisms of Yang et al. (2011) [1,2] and Metcalf et al. (2009, 2007) [3,4] were used as base models and then refined to propose a new MP/EP pyrolysis mechanism.