The Critical Pressure at the Onset of Flame Instability of Syngas/Air/Diluent Outwardly Expanding Flame at Different Initial Temperatures and Pressures
| Autor: | Ziyu Wang, Guangying Yu, Hameed Metghalchi, Ziwei Bai, Sai C. Yelishala |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Hydrodynamic stability
Materials science Hydrogen Renewable Energy Sustainability and the Environment 020209 energy Mechanical Engineering 05 social sciences Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Combustion Diluent Instability chemistry.chemical_compound Fuel Technology chemistry Chemical engineering Geochemistry and Petrology 0502 economics and business Carbon dioxide 0202 electrical engineering electronic engineering information engineering 050207 economics Carbon Syngas |
| Zdroj: | Journal of Energy Resources Technology. 141 |
| ISSN: | 1528-8994 0195-0738 |
| DOI: | 10.1115/1.4042720 |
| Popis: | Syngas has gained attention recently due to its high energy density and environmentally friendly characteristics. Flame stability plays an important role in flame propagation in energy conversion devices. Experimental studies were performed in a cylindrical chamber to investigate flame instability of syngas/air/diluent mixture. A Z-shape Schlieren system coupled with a high-speed complementary metal–oxide–semiconductor camera was used to record flame pictures up to 40,000 frames per second. In this research, syngas is a mixture of hydrogen and carbon monoxide and diluent is a blend of 14% CO2 and 86% N2 with the same specific heat as the burned gases. Three main flame instabilities namely Rayleigh–Taylor (body force) instability, hydrodynamic instability, and thermal-diffusive instability have been studied. For the onset of flame instability, a power law correlation for the ratio of critical pressure to initial pressure of syngas/air/diluent flames over a wide range of initial temperatures (298–450 K), initial pressures (1.0–2.0 atm), equivalence ratios (0.6–3.0), diluent concentrations (0–10%), and hydrogen percentages (5–25%) in the fuel has been developed. |
| Databáze: | OpenAIRE |
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