Abstract
The temporal variation of chemiluminescence emission from OH∗(A2 Σ +) and CH∗(A2 Δ) in reacting Ar-diluted H2/O2/CH4, C2H2/O2 and C2H2/N2O mixtures was studied in a shock tube for a wide temperature range at atmospheric pressures and various equivalence ratios. Time-resolved emission measurements were used to evaluate the relative importance of different reaction pathways. The main formation channel for OH∗ in hydrocarbon combustion was studied with CH4 as benchmark fuel. Three reaction pathways leading to CH∗ were studied with C2H2 as fuel. Based on well-validated ground-state chemistry models from literature, sub-mechanisms for OH∗ and CH∗ were developed. For the main OH∗-forming reaction CH+O2=OH∗+CO, a rate coefficient of k 2=(8.0±2.6)×1010 cm3 mol−1 s−1 was determined. For CH∗ formation, best agreement was achieved when incorporating reactions C2+OH=CH∗+CO (k 5=2.0×1014 cm3 mol−1 s−1) and C2H+O=CH∗+CO (k 6=3.6×1012exp(−10.9 kJ mol−1/RT) cm3 mol−1 s−1) and neglecting the C2H+O2=CH∗+CO2 reaction.
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The authors gratefully acknowledge the Deutsche Forschungsgemeinschaft (DFG) for financial support within the cooperative project “Chemiluminescence and heat release”.
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Bozkurt, M., Fikri, M. & Schulz, C. Investigation of the kinetics of OH∗ and CH∗ chemiluminescence in hydrocarbon oxidation behind reflected shock waves. Appl. Phys. B 107, 515–527 (2012). https://doi.org/10.1007/s00340-012-5012-y
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DOI: https://doi.org/10.1007/s00340-012-5012-y