Intensification mechanisms of the lean hydrogen-air combustion via addition of suspended micro-droplets of water
| Autor: | A. D. Kiverin, I.S. Yakovenko |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Hydrogen Renewable Energy Sustainability and the Environment Wave propagation Flame structure Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Mechanics 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Combustion 01 natural sciences Instability 0104 chemical sciences Fuel Technology chemistry Scientific method Excited state 0210 nano-technology Intensity (heat transfer) |
| Zdroj: | International Journal of Hydrogen Energy. 46:1259-1272 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2020.09.234 |
| Popis: | The present study is devoted to the detailed numerical analysis of the combustion wave propagation in the confined vessel filled with the lean 15% hydrogen-air mixture containing suspended micro-droplets of water. Considered gaseous mixtures possesses a relatively low reactivity, and so the intensity of the combustion is moderate. Herewith, it is found that the flame can be noticeably accelerated in the presence of suspended micro-droplets with a diameter larger than 50 μm. Numerical analysis of the flame structure performed via in-house computational package developed by authors showed that the interaction between the flame and the droplets results in the intensification of the flame instability and small scale flame front wrinkling. It is demonstrated that along with the scales associated with intrinsic hydrodynamic and thermo-diffusive modes of flame front instability, smaller wrinkles are excited as a result of the local effect of micro-droplets on the flame front. The rapid growth of the corrugated flame surface leads to the combustion intensification, and in the considered system, the burnout process can proceed up to 2.2 times faster in the presence of micro-droplets of 200 μm diameter than in the pure gaseous mixture. It is expected that distinguished mechanisms of the influence of water droplets on the flame front structure are relevant for the other two-phase combustible systems, such as reactive gaseous mixtures with suspended fuel droplets or solid particles. |
| Databáze: | OpenAIRE |
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