反射冲击波后合成气混合物自燃的实验和动力学模型研究

IF 1.7 4区 工程技术 Q3 MECHANICS Shock Waves Pub Date : 2024-09-22 DOI:10.1007/s00193-024-01191-4
P. A. Vlasov, V. N. Smirnov, G. A. Shubin, A. V. Arutyunov
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引用次数: 0

摘要

报告了对反射冲击波后的\(\hbox {H}_{2}}{-}hbox {CO}{-}\hbox {O}_{2}}{-}hbox {Ar}\)混合物点火的实验和动力学模型研究结果。实验使用的测试混合物包括:(0.75{-}3.0{%}(box {H}_{2}})、(0{%}{-}3.0{/%}(box {CO})和(1.5{\%}\,\hbox {O}_{{2}}\) 在氩气中进行,温度为 950 至 1650 K,气体总浓度为 ({\sim }10^{{-5}}~ \hbox {mol}/\hbox {cm}^{3}}\ )。通过记录反射冲击波后压力的时间变化、电子激发的 OH* 自由基在 308.0 ± 2.0 nm 处的化学发光强度以及基态 OH 自由基在 306.772 nm 铋原子线处的吸收,对反应进行了监测。测量参数是达到基态 OH 浓度为 2.0 倍 10^{{-9}~\hbox {mol}/\hbox {cm}^{{3}} 的时间和达到最大 OH* 发射强度的时间。动力学模拟表明,\(uptau _{{1}}\)对应于燃料消耗的开始时间,而\(\uptau _{{2}}\)对应于大部分燃料被消耗的时间。因此,点火过程被视为由两个阶段组成:诱导期(\uptau _{{1}})和燃尽时间(\uptau _{{2}}-\uptau _{{1}})。这两个时间间隔显示了对动力学机制基本反应的不同敏感性。我们使用了一个能够预测碳氢化合物杂质的存在、氧振动弛豫和压力上升等影响的数值模型来模拟实验。当考虑到这些额外因素时,实验结果和理论结果之间的一致性最好。除了通过灵敏度系数分析来确定最重要的反应之外,还提出了一个新的标准,即相对综合产量,该标准通过其确定产量最高的反应的能力对灵敏度系数分析进行了补充。
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An experimental and kinetic modeling study of the autoignition of syngas mixtures behind reflected shock waves

The results of an experimental and kinetic modeling study of the ignition of \(\hbox {H}_{{2}}{-}\hbox {CO}{-}\hbox {O}_{{2}}{-}\hbox {Ar}\) mixtures behind the reflected shock wave are reported. The experiments were performed with test mixtures containing \(0.75{-}3.0{\%}\,\hbox {H}_{{2}}\), \(0{\%}{-}3.0{\%}\,\hbox {CO}\), and \(1.5{\%}\,\hbox {O}_{{2}}\) in argon at temperatures from 950 to 1650 K and a total gas concentration of \({\sim }10^{{-5}}~ \hbox {mol}/\hbox {cm}^{{3}}\). The reaction was monitored by recording the time evolution of the pressure behind the reflected shock wave, intensity of the chemiluminescence of electronically excited OH* radicals at 308.0 ± 2.0 nm, and the absorption by ground-state OH radicals at a 306.772-nm bismuth atomic line. The measured parameters were the time \(\uptau _{{1}}\) it took to reach a ground-state OH concentration of \(2.0 \times 10^{{-9}}~\hbox {mol}/\hbox {cm}^{{3}}\) and the time \(\uptau _{{2}}\) to reach the maximum OH* emission intensity. Kinetic simulations demonstrated that \(\uptau _{{1}}\) corresponds to the beginning of fuel consumption, and \(\uptau _{{2}}\) to the time for most of the fuel to be consumed. Therefore, the process of ignition was treated as consisting of two stages: the induction period \(\uptau _{{1}}\) and the burnout time \(\uptau _{{2}}-\uptau _{{1}}\). These two time intervals demonstrate different sensitivity to the elementary reactions of the kinetic mechanism. A numerical model capable of predicting the effects of the presence of hydrocarbon impurity, oxygen vibrational relaxation, and pressure rise was used to simulate the experiment. The best agreement between experimental and theoretical results is achieved when these additional factors are taken into account. In addition to the sensitivity coefficient analysis for identifying the most important reactions, a new criterion, referred to as the relative integrated production, was proposed, which compliments the sensitivity coefficient analysis through its ability to identify the most productive reactions.

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来源期刊
Shock Waves
Shock Waves 物理-力学
CiteScore
4.10
自引率
9.10%
发文量
41
审稿时长
17.4 months
期刊介绍: Shock Waves provides a forum for presenting and discussing new results in all fields where shock and detonation phenomena play a role. The journal addresses physicists, engineers and applied mathematicians working on theoretical, experimental or numerical issues, including diagnostics and flow visualization. The research fields considered include, but are not limited to, aero- and gas dynamics, acoustics, physical chemistry, condensed matter and plasmas, with applications encompassing materials sciences, space sciences, geosciences, life sciences and medicine. Of particular interest are contributions which provide insights into fundamental aspects of the techniques that are relevant to more than one specific research community. The journal publishes scholarly research papers, invited review articles and short notes, as well as comments on papers already published in this journal. Occasionally concise meeting reports of interest to the Shock Waves community are published.
期刊最新文献
An experimental and kinetic modeling study of the autoignition of syngas mixtures behind reflected shock waves Asymmetry of imploding detonations in thin channels Thematic issue on blast exposure research in military training environments Optical measurement of state variables associated with blast wave evolution Influence of fuel inhomogeneity on detonation wave propagation in a rotating detonation combustor
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