Investigation of the kinetics of OH* and CH* chemiluminescence in hydrocarbon oxidation behind reflected shock waves
Investigation of the kinetics of OH* and CH* chemiluminescence in hydrocarbon oxidation behind reflected shock waves
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DOI：
10.1007/s00340-012-5012-y
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发表时间：
2012-06-01
影响因子：
2.1
通讯作者：
Schulz, C.
中科院分区：
文献类型：
--
作者：
Bozkurt, M.;Fikri, M.;Schulz, C.
在激波管中研究了Ar稀释的H-2/O-2/CH4、C2H2/O-2和C2H2/N2O混合气体中Ohau(A(2)I Pound(+))和Chau(A(2)Delta)的化学发光随时间的变化。使用时间分辨发射测量来评估不同反应路径的相对重要性。以甲烷为基准燃料，研究了碳氢化合物燃烧过程中OHAU的主要生成通道。以C2H2为燃料，研究了三条通向CHU的反应路径。基于文献中经过充分验证的基态化学模型，发展了Ohau和Chau的子机理。对于主要的OHAU生成反应CH+O-2=OHAU+CO，测得速率系数k(2)=(8.0+/-2.6)×10(10)cm(3)mol(-1)S(-1)。C2H+O=CHU+CO(k(5)=2.0×10(14)cm(-1)，S(-1))和C2H+O=CHU+CO(k(6)=3.6×10(12)exp(-10.9kJ mol(-1)/RT)cm(-3)mol(-1)S(-1))。
The temporal variation of chemiluminescence emission from OHau(A(2) I pound (+)) and CHau(A(2) Delta) in reacting Ar-diluted H-2/O-2/CH4, C2H2/O-2 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 OHau in hydrocarbon combustion was studied with CH4 as benchmark fuel. Three reaction pathways leading to CHau were studied with C2H2 as fuel. Based on well-validated ground-state chemistry models from literature, sub-mechanisms for OHau and CHau were developed. For the main OHau-forming reaction CH+O-2=OHau+CO, a rate coefficient of k (2)=(8.0 +/- 2.6)x10(10) cm(3) mol(-1) s(-1) was determined. For CHau formation, best agreement was achieved when incorporating reactions C-2+OH=CHau+CO (k (5)=2.0x10(14) cm(3) mol(-1) s(-1)) and C2H+O=CHau+CO (k (6)=3.6x10(12)exp(-10.9 kJ mol(-1)/RT) cm(3) mol(-1) s(-1)) and neglecting the C2H+O-2=CHau+CO2 reaction.