Experimental and kinetic study on JP-10/air autoignition and the effect of NO2 at high temperatures

Ignition delay times of JP-10 in air and the vitiation effect of NO2 on JP-10 autoignition at high temperatures were investigated behind reflected shock waves. The experiments were carried out at pressures of 2 and 10 atm, temperatures between 900 and 1460 K, fuel lean and stoichiometric conditions with and without 1.0 % NO2. The experimental results show that the ignition delay times of JP-10/air decrease with the increase of pressure or the decrease of equivalence ratio. The effect of adding 1.0 % NO2 is pressure dependence. At 10 atm, the addition of NO2 promotes the ignition of fuel, which shortens the ignition delay time. At 2 atm, the addition of 1.0 % NO2 inhibits the ignition of JP-10, which prolongs the ignition delay time. A chemical kinetic mechanism of JP-10/ NO2 consisting of 290 species and 1768 reactions was developed by extending from a C0-C5 alkane and a cyclopentene sub-mechanism. The proposed mechanism has been well validated by ignition delay times, laminar flame speeds and species concentration profiles from literature. To further investigate the autoignition of JP-10 and the vitiation effect of NO2, kinetics analyses including reaction pathways and sensitivity coefficients were performed by the developed mechanism. The main consumption pathways of JP-10 in air are H-abstraction reactions from JP-10 by HO2 radicals. With 1.0 % NO2 vitiation, the addition of NO2 has a strong effect on JP-10 consumption via the H-abstraction pathway JP-10 + NO2 = C10H15 + HONO, which further affects the auto -ignition of JP-10.

Automated summary

The ignition delay times of JP-10 in air and the effect of NO2 on JP-10 autoignition were investigated in this study. Experimental results showed that the ignition delay times were influenced by pressure and equivalence ratio. The addition of NO2 promoted or inhibited the ignition of JP-10, depending on the pressure conditions. A chemical kinetic mechanism was developed and validated, and kinetics analyses were performed to further understand the ignition and vitiation effects.