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CO-concentration and temperature measurements in reacting CH4/O2 mixtures doped with diethyl ether behind reflected shock waves
Combustion and Flame ( IF 4.4 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.combustflame.2020.02.024
Dong He , Lin Shi , Damien Nativel , Jürgen Herzler , Mustapha Fikri , Christof Schulz

Abstract The oxidation of CH4/diethyl ether mixtures was studied with laser absorption-based time-resolved temperature and CO concentration measurements behind reflected shock waves. Fuel-rich (equivalence ratio ϕ = 2.0) mixtures were studied because of their relevance for mechanism development for partial oxidation reactions in the context of polygeneration processes and measurements at ϕ = 0.5 and 1.0 were used to verify the mechanism performance in an extended range of equivalence ratios. Temperature and CO concentration were measured via absorption using two fundamental vibrations of CO (ν" = 0, P20 and ν" = 1, R21) with two mid-IR quantum-cascade lasers near 4.8546 and 4.5631 µm. Interference from broadband absorption of CO2 in the region near 4.56 µm was quantified based on measured temperature-dependent CO2 absorption cross-sections and mechanism-based prediction of CO2 concentrations. The measured temporal CO-concentration and temperature profiles were compared with simulations based on two mechanisms (Fikri et al., 2017; Yasunaga et al., 2010). For mixtures with ϕ = 0.5, the two mechanisms show similar results, and well reproduce the experimental data. At ϕ = 1.0 and 2.0, the Fikri et al. mechanism shows very good agreement with the experiments whereas the Yasunaga et al. mechanism predicts a too fast CO-concentration and temperature rise.

中文翻译:

在反射冲击波后掺杂二乙醚的 CH4/O2 混合物反应中的 CO 浓度和温度测量

摘要 利用基于激光吸收的时间分辨温度和反射冲击波后的 CO 浓度测量,研究了 CH4/乙醚混合物的氧化。研究了富燃料(当量比 ϕ = 2.0)混合物,因为它们与多联产过程中部分氧化反应的机制发展相关,并且在 ϕ = 0.5 和 1.0 处的测量用于验证扩展范围内的机制性能当量比。温度和 CO 浓度通过使用 CO 的两个基本振动(ν" = 0, P20 和 ν" = 1, R21)和两个中红外量子级联激光器在 4.8546 和 4.5631 µm 附近进行吸收测量。来自 4 附近区域 CO2 宽带吸收的干扰。56 µm 是根据测得的与温度相关的 CO2 吸收截面和基于机制的 CO2 浓度预测来量化的。将测得的时间 CO 浓度和温度分布与基于两种机制的模拟进行比较(Fikri 等人,2017 年;Yasunaga 等人,2010 年)。对于 ϕ = 0.5 的混合物,两种机制显示出相似的结果,并且很好地再现了实验数据。在 ϕ = 1.0 和 2.0 时,Fikri 等人。机制显示出与实验非常吻合,而 Yasunaga 等人。机制预测过快的 CO 浓度和温度上升。两种机制显示出相似的结果,并且很好地再现了实验数据。在 ϕ = 1.0 和 2.0 时,Fikri 等人。机制显示出与实验非常吻合,而 Yasunaga 等人。机制预测过快的 CO 浓度和温度上升。两种机制显示出相似的结果,并且很好地再现了实验数据。在 ϕ = 1.0 和 2.0 时,Fikri 等人。机制显示出与实验非常吻合,而 Yasunaga 等人。机制预测过快的 CO 浓度和温度上升。
更新日期:2020-06-01
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