Methane/n-butane ignition delay measurements at high pressure and detailed chemical kinetic simulations

Autoignition delay time measurements were recorded for blends of CH ₄/n-C4H10 in "air" at pressures of approximately 10, 16, 20, 25, and 30 atm from fuel-lean to fuel-rich conditions at two different fuel compositions, 90%CH₄/10% n-C₄H₁₀ and 70%CH ₄/30% n-C₄H₁₀, and temperatures from 660 to 1330K in both a rapid compression machine and a shock-tube facility. A detailed chemical kinetic model consisting of 1328 reactions involving 230 species was validated using the ignition delay data from this study. This mechanism has already been used to simulate previously published ignition delay times over a wide range of conditions. It was found that the model quantitatively reproduces the ignition delays from both rapid compression and reflected shock waves, accurately capturing reactivity as a function of the temperature, pressure, equivalence ratio, and fuel composition.