Time-resolved measurements of OH during auto-ignition of syngas with trimethylsilanol and hexamethyldisiloxane

IF 6.2 2区工程技术 Q2 ENERGY & FUELS Combustion and Flame Pub Date : 2025-04-01 Epub Date: 2025-02-12 DOI:10.1016/j.combustflame.2025.114025

John H. Kim , Andrew B. Mansfield , Miles A. Burnett , Robert S. Tranter , Margaret S. Wooldridge

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Abstract

The effects of trimethylsilanol (TMSO) and hexamethyldisiloxane (HMDSO) addition on OH time histories during syngas (H₂ and CO) ignition were investigated using the University of Michigan rapid compression facility. Experiments spanned temperatures of 1010–1080 K, at a pressure of approximately 5 atm. Syngas mixtures of 1.2 % H₂/2.8 % CO/20 % O₂ by volume (balance N₂ and Ar) provided a baseline for comparison with mixtures that included 100, 200, and 1000 ppm of the TMSO and 100 ppm of HMDSO. Narrow-line ultraviolet laser-absorption was used to measure OH mole-fraction during ignition. The addition of TMSO and HMDSO significantly shifted the OH time-histories earlier in time, by up to 51 %, compared with the baseline syngas mixture. The value of the maximum OH mole fraction was consistent between the 100 and 200 ppm TMSO mixtures and the 100 ppm HMDSO mixtures, but the maximum OH increased significantly with the 1000 ppm TMSO mixtures. The OH data indicate TMSO and HMDSO were not direct sources of OH radicals. Analysis further indicates the TMSO and HMDSO decompose rapidly followed by reactions that enhance the production of H atoms, and the increased reactivity observed is via the H + O₂ = OH + O reaction.

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三甲基硅醇和六甲基二硅氧烷合成气自燃过程中羟基的时间分辨测量

利用密歇根大学的快速压缩装置，研究了三甲基硅醇（TMSO）和六甲基二硅氧烷（HMDSO）对合成气（H2和CO）点火过程中OH时程的影响。实验温度为1010-1080 K，压力约为5 atm。1.2% h2 / 2.8% CO/ 20% O2（平衡氮气和氩气）的合成气混合物提供了一个基线，用于与含有100、200和1000 ppm的TMSO和100 ppm的HMDSO的混合物进行比较。采用窄线紫外激光吸收法测量了氢氧根点燃过程中的摩尔分数。与基准合成气混合物相比，加入TMSO和HMDSO显著地提前改变了OH时程，改变幅度高达51%。最大OH摩尔分数的值在100和200 ppm的TMSO和100 ppm的HMDSO混合物之间是一致的，但最大OH的值在1000 ppm的TMSO混合物中显著增加。OH数据表明，TMSO和HMDSO不是OH自由基的直接来源。进一步分析表明，TMSO和HMDSO分解迅速，随后发生的反应增强了H原子的生成，反应活性的增强是通过H + O2 = OH + O反应实现的。

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来源期刊

Combustion and Flame 工程技术-工程：化工

CiteScore

9.50

自引率

20.50%

发文量

631

审稿时长

3.8 months

期刊介绍： The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.