Time-resolved measurements of OH during auto-ignition of syngas with trimethylsilanol and hexamethyldisiloxane
Document Type
Article
Publication Date
2025
Department/School
Engineering Technology
Publication Title
Combustion and Flame
Abstract
he 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.
Link to Published Version
Recommended Citation
Kim, J. H., Mansfield, A. B., Burnett, M. A., Tranter, R. S., & Wooldridge, M. S. (2025). Time-resolved measurements of OH during auto-ignition of syngas with trimethylsilanol and hexamethyldisiloxane. Combustion and Flame, 274, 114025. https://doi.org/10.1016/j.combustflame.2025.114025
Comments
A. B. Mansfield is a faculty member in EMU's School of Engineering.