Ignition properties of butane and methane/butane mixtures studied in a rapid compression machine

摘要

Autoignition delay times of pure butane and butane/methane mixtures have been measured at temperatures ranging from 660-1110K and pressures between 15-45 bar. In contrast to the methane/butane mixtures, pure n-butane and iso-butane exhibit a negative temperature coefficient (NTC) region, and at low temperatures two-stage ignition is observed for both fuels. Experiments show that the addition of 3% butane to methane results in a substantial reduction in the ignition delay time. In general, calculations using a comprehensive mechanism for butane ignition shows good agreement with the measurements for all pure n-butane, iso-butane/methane and n-butane/methane mixtures. However large differences are observed for iso-butane mixtures below ～ 950 K.