Abstract
Autoignition and oxidation of n-butane and iso-butane mixtures in air were studied in a shock tube at conditions where few data exist, namely at temperatures above 1100 K and for undiluted fuel-air mixtures. The experiments were performed in the reflected-shock region over the temperature range of 1150 - 1470 K, an average pressure of 1.45 atm, and equivalence ratios of 0.5 and 1.0. Ignition delay times were obtained for mixtures of n- C4H10/iso-C4H10 in the ratios of 100/0, 0/100, and 50/50. Ignition was determined from the pressure trace measured at the shock-tube endwall. Effect of composition, stoichiometry and temperature were explored for the mixtures. Under all conditions, normal butane was shown to be more readily ignitable than its isomer iso-butane. The experimental results should serve as validation to chemical kinetics mechanisms containing at least C4Hx hydrocarbons that lack benchmark data, especially at elevated temperature conditions.
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