An experimental and kinetic modeling study of n-propanol and i-propanol ignition at high temperatures

Abstract

Ignition delay times of n- and i-propanol mixtures in argon-diluted oxygen were measured behind reflected shocks. Experimental conditions are: temperatures from 1100 and 1500K, pressures from 1.2 to 16.0atm, fuel concentrations of 0.5%, 0.75%, 1.0%, and equivalence ratios of 0.5, 1.0 and 2.0. A detailed kinetic model consisting of 238 species and 1448 reactions was developed to simulate the ignition of the two propanol isomers, with the computed ignition delay times agreeing well with the present measured results as well as the literature data at other conditions. Further validation of the kinetic mechanism was conducted by comparing the simulated results with measured JSR data and laminar flame speeds, and reasonable agreements were achieved for all test conditions. Moreover, reaction pathway analysis indicated that n-propanol mainly produces ethenol, ethene and propene, while i-propanol primarily produces acetone and propene. Finally, sensitivity analysis demonstrated that some fuel-species reactions can be found in the most important reactions for both propanols, and these are mainly the H-abstraction reactions.