Multi-species measurements in 2-butanol and i-butanol pyrolysis behind reflected shock waves
2013
Stranic, Ivo | Pyun, Sung Hyun | Davidson, David Frank | Hanson, Ronald Kenneth
The kinetics of 2-butanol and i-butanol pyrolysis were investigated by measuring multi-species time histories using shock tube/laser absorption methods. Species time histories of OH, H₂O, C₂H₄, CO, and CH₄ were measured behind reflected shock waves using UV and IR laser absorption during the high-temperature decomposition of 1% butanol/argon mixtures. Initial reflected shock temperatures and pressures for these experiments covered 1270–1640K and 1.3–1.9atm. These are the first multi-species time history measurements in shock tubes for 2-butanol and i-butanol. Production pathways and reaction rate sensitivities for the measured species are analyzed using the recent Sarathy et al. [36] detailed mechanism. It is observed that radical branching in 2-butanol is a highly complicated process with multiple reactions indistinguishably affecting the measured species profiles. However, i-butanol exhibits relatively simple radical branching, and evidence is presented that demonstrates radical branching must be adjusted to favor the iC₄H₈OH-β channel. Recommendations for i-butanol+H reactions are suggested and significant improvements between measurements and simulations using the Sarathy et al. [36] mechanism are achieved with these revised values.
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