Abstract
Auto-ignition of iso-butane/hydrogen mixtures were measured in a shock tube at pressures of 2 and 10 atm, equivalence ratio of 0.5, and temperatures from 1050 to 1590 K. New ignition delay time data of the binary mixtures were given to guide practical application and model development. Ignition delay time correlations of the iso-butane/hydrogen mixtures were provided. Four available kinetic models, namely the Aramco3.0 Mech, JetSurf2.0 Mech, USC2.0 Mech, and Li Mech, were validated against the experimental data. Li Mech can reproduce the ignition delay behavior of hydrogen, iso-butane, and their blends, therefore was adopted in this study to interpret the ignition chemistry of the iso-butane/hydrogen mixture. Hydrogen addition can promote the iso-butane ignition non-linearly at high temperatures. iso-butane molecule and the derived radicals break their chemical bonds mainly by colliding with free radicals under the current conditions, hydrogen addition can increase the radical pool concentration thus promote the reactivity. The hydrogen oxidation channel become dominated when the hydrogen ratio is as large as 98% thus lead to the significantly reduced ignition delay time.
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