Abstract
Biobutanol (i.e., n-butanol) can be used as a substitute for spark ignition and homogeneous charge compression ignition (HCCI) engines. Its low-temperature reactions will determine the autoignition process and will have a significant effect on the heat release rate in the HCCI engines. In order to understand the temporal evolution of such reactions, the formation and concentration of intermediates formed in the oxidation of n-butanol was studied by means of a fast gas sampling probe in a single-cylinder four-stroke HCCI engine. The species in the sampled gas were identified through gas chromatography. Isooctane was used as a reference fuel to find the effect of fuel structure on the low-temperature reactions. The dominant reaction routes related to the formation of intermediate products and autoignition for n-butanol and isooctane were investigated through sensitivity analysis. The results show that for the air–fuel mixture diluted by residual gases in the cylinder, n-butanol autoignites more easily than ...
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