Competitive oxidation of methane and C2 hydrocarbons discerned by isotopic labeling and laser absorption spectroscopy of CO isotopologues in shock-heated mixtures
| Autor: | Fabio A. Bendana, R. Mitchell Spearrin, Daniel I. Pineda |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Alkane
chemistry.chemical_classification Materials science 010304 chemical physics Absorption spectroscopy General Chemical Engineering Analytical chemistry General Physics and Astronomy Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology General Chemistry Combustion 01 natural sciences Methane chemistry.chemical_compound Fuel Technology 020401 chemical engineering chemistry Acetylene 0103 physical sciences Isotopologue 0204 chemical engineering Carbon Carbon monoxide |
| Zdroj: | Combustion and Flame. 224:54-65 |
| ISSN: | 0010-2180 |
| DOI: | 10.1016/j.combustflame.2020.11.006 |
| Popis: | The competitive oxidation of methane with C 2 hydrocarbons of differing functional groups (alkane, alkene, and alkyne) was examined experimentally via combustion of isotopically-labeled fuel mixtures and laser absorption spectroscopy of carbon monoxide isotopologues. Quantitative species time-histories of the 12 CO and 13 CO isotopologues were measured simultaneously and in situ using laser absorption spectroscopy behind reflected shock waves, used for near-instantaneous heating and auto-ignition of binary mixtures containing equal carbon fractions of the different fuels. A driver extension and gas tailoring were employed on the shock tube facility to extend test times up to 30 milliseconds, enabling dilute ignition of the fuel blends over a range of temperatures from 1100–1800 K. Tested fuel mixtures were primarily fuel-rich to force the competition of carbon oxidation between the fuel components. The novel dataset of multi-isotopologue species time-histories were compared to available chemical mechanisms, revealing insights on the influence of each C 2 fuel on methane ignition. The GRI-MECH 3.0 and Foundational Fuel Chemistry Model (FFCM-1) reaction models were modified to incorporate 13 C reactions and species. Detailed comparison of the measurement data with FFCM-1 simulations revealed generally good agreement at elevated temperatures ( > 1500 K), with increasing divergence at lower temperatures, particularly for mixtures involving ethane and acetylene. Reaction pathway and sensitivity analysis of the variance between data and the modified mechanisms reveal key reactions likely responsible for the disagreements. |
| Databáze: | OpenAIRE |
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