Effect of soret diffusion on lean hydrogen/air flames at normal and elevated pressure and temperature
| Autor: | Yuriy Shoshin, Jeroen A. van Oijen, Francisco E. Hernández-Pérez, Zhen Zhou, Laurentius P.H. de Goey |
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| Přispěvatelé: | Power & Flow, Group De Goey, Group Van Oijen |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Hydrogen
General Chemical Engineering Diffusion General Physics and Astronomy Energy Engineering and Power Technology Thermodynamics chemistry.chemical_element 02 engineering and technology 01 natural sciences 7. Clean energy 010305 fluids & plasmas Pressure range 020401 chemical engineering 0103 physical sciences 0204 chemical engineering Soret diffusion Chemistry hydrogen/air General Chemistry cellular flame Fuel Technology mass burning rate 13. Climate action Modeling and Simulation Stretch rate Early phase |
| Zdroj: | Combustion Theory and Modelling, 21(5), 879-896. Taylor and Francis Ltd. |
| ISSN: | 1364-7830 |
| Popis: | The influence of Soret diffusion on lean premixed flames propagating in hydrogen/air mixtures is numerically investigated with a detailed chemical and transport models at normal and elevated pressure and temperature. The Soret diffusion influence on the one-dimensional (1D) flame mass burning rate and two-dimensional (2D) flame propagating characteristics is analysed, revealing a strong dependency on flame stretch rate, pressure and temperature. For 1D flames, at normal pressure and temperature, with an increase of Karlovitz number from 0 to 0.4, the mass burning rate is first reduced and then enhanced by Soret diffusion of H2 while it is reduced by Soret diffusion of H. The influence of Soret diffusion of H2 is enhanced by pressure and reduced by temperature. On the contrary, the influence of Soret diffusion of H is reduced by pressure and enhanced by temperature. For 2D flames, at normal pressure and temperature, during the early phase of flame evolution, flames with Soret diffusion display more curved flame cells. Pressure enhances this effect, while temperature reduces it. The influence of Soret diffusion of H2 on the global consumption speed is enhanced at elevated pressure. The influence of Soret diffusion of H on the global consumption speed is enhanced at elevated temperature. The flame evolution is more affected by Soret diffusion in the early phase of propagation than in the long run due to the local enrichment of H2 caused by flame curvature effects. The present study provides new insights into the Soret diffusion effect on the characteristics of lean hydrogen/air flames at conditions that are relevant to practical applications, e.g. gas engines and turbines. |
| Databáze: | OpenAIRE |
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