反射激波后甲烷预点燃行为的新见解

IF 1.7 4区 工程技术 Q3 MECHANICS
J. Caravaca-Vilchez, K. A. Heufer
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引用次数: 0

摘要

预点火是一个不希望的燃烧事件,已知限制动力学建模验证。以前的甲烷氧化研究报告过早点火是激波管点火延迟时间测量的一部分。在此背景下,研究了不同稀释度\(\hbox {N}_2\)、Ar、He和\(\hbox {CO}_2\)对化学计量甲烷混合物在10 bar和25 bar、1080 K和1350 K温度下的预燃倾向和自燃行为的影响。除了常规的侧壁压力和端壁光发射测量外,还使用了高速成像装置来可视化点火过程。用相关的物理化学参数来描述和预测预燃现象。结果表明,稀释至\(80\%\)的浴气水平不能成功地减轻早期着火的发生及其在中等压力下的影响。用He代替\(\hbox {N}_2\)被发现在10bar时抑制了早期点火,这归因于测试气体段温度不均匀性的增强耗散。目前的研究结果表明,\(\hbox {CO}_2\)具有潜在的预点火热释放缓解,而Ar被证实促进过早点火。据我们所知,我们提出了对激波管中甲烷混合物的预点火缓解的第一个详细研究,其中对其点火非理想性给出了进一步的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

New insights into the pre-ignition behavior of methane behind reflected shock waves

New insights into the pre-ignition behavior of methane behind reflected shock waves

Pre-ignition is an undesired combustion event known to restrict kinetic modeling validation. Previous methane oxidation studies reported premature ignition as part of ignition delay time measurements in shock tubes. In this context, the effect on the pre-ignition propensity and auto-ignition behavior of stoichiometric methane mixtures at different dilution levels of \(\hbox {N}_2\), Ar, He, and \(\hbox {CO}_2\) was studied at 10 bar and 25 bar and temperatures between 1080 K and 1350 K. In addition to conventional sidewall pressure and endwall light emission measurements, a high-speed imaging setup was utilized to visualize the ignition process. Relevant physicochemical parameters to describe and predict the pre-ignition phenomenon were used. The results suggest that dilution levels up to \(80\%\) of bath gas are not successful in mitigating early ignition occurrence and its effects at moderate pressures. Replacing \(\hbox {N}_2\) by He was found to suppress early ignition at 10 bar, attributed to an enhanced dissipation of temperature inhomogeneities in the test gas section. The present findings demonstrate that \(\hbox {CO}_2\) has potential for pre-ignition heat release mitigation, while Ar was confirmed to promote premature ignition. To the best of our knowledge, we present the first detailed study on pre-ignition mitigation for methane mixtures in shock tubes, where further insights into its ignition non-idealities are given.

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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.
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