Analysis of flame stabilization mechanism in a hydrogen-fueled reacting wall-jet flame
| Autor: | Ying Piao, Hai Liu, Wantong Wu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Shock wave
Jet (fluid) Materials science Hydrogen Renewable Energy Sustainability and the Environment 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 Chemical explosive 0104 chemical sciences Physics::Fluid Dynamics chemistry.chemical_compound Fuel Technology chemistry Physics::Chemical Physics Diffusion (business) 0210 nano-technology Reynolds-averaged Navier–Stokes equations Large eddy simulation |
| Zdroj: | International Journal of Hydrogen Energy. 44:26609-26623 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2019.08.073 |
| Popis: | In this study, the novel conservative representation of chemical explosive mode analysis is augmented to analyze the key flame features in the Burrows-Kurkov flames simulated by both Reynolds-Averaged Navier-Stokes (RANS) and large eddy simulation (LES). Subtle difference are revealed in flame stabilization mechanisms resulting from the difference in modeling and spatial resolution. RANS shows that, ahead of the flame onset location, the composition diffusion and shock wave compression play dominant roles in chemical explosion indicating that the flame is stabilized by the assisted-ignition combustion mode. In contrast, LES shows that the flame is stabilized by the auto-ignition mode since the nonchemical contribution counteracts chemical reaction during the development of ignited flame kernels. For RANS, the radical pool builds up through the unphysical back diffusion near the flame stabilization front, which reveals the limitation of RANS method in the resolution and characterization of the key flame features in Burrows-Kurkov flames. |
| Databáze: | OpenAIRE |
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