Numerical Simulations of DDT Limits in Hydrogen-Air Mixtures in Obstacle Laden Channel
| Autor: | Andrzej Teodorczyk, W. Rudy |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Work (thermodynamics)
Control and Optimization Materials science Hydrogen 020209 energy Detonation Energy Engineering and Power Technology chemistry.chemical_element ddtFoam obstacle laden tube 02 engineering and technology lcsh:Technology DDT hydrogen-air DDT limits Acceleration 020401 chemical engineering 0202 electrical engineering electronic engineering information engineering Range (statistics) 0204 chemical engineering Electrical and Electronic Engineering Engineering (miscellaneous) Deflagration to detonation transition lcsh:T Renewable Energy Sustainability and the Environment Mechanics chemistry Obstacle Energy (miscellaneous) Communication channel |
| Zdroj: | Energies, Vol 14, Iss 24, p 24 (2021) Energies; Volume 14; Issue 1; Pages: 24 |
| ISSN: | 1996-1073 |
| DOI: | 10.3390/en14010024 |
| Popis: | The main aim of this study was to perform numerical simulations of deflagration to detonation transition process (DDT) in hydrogen–air mixtures and assess the capabilities of freeware open-source ddtFoam code to simulate and capture DDT limits. The numerical geometry was based on the real 0.08 × 0.11 × 4 m (H × W × L), rectangular cross-section detonation channel previously used to experimentally investigate DDT limits in obstacle-filled channel. The constant blockage ratio (BR) equal to 0.5 was kept for three obstacle spacing configurations: S = H, 2H, 3H. The results showed that hydrogen concentration limits for successful DDT from simulations are close to the experimental values, however, the simulated DDT limits range is wider than the experimental one and depends on the obstacles spacing. The numerical results were analyzed by means of propagation velocities, overpressures, and run-up distances. The best match between numerical and experimental DDT limits was observed for obstacles spacing L = 3H and the lowest match for spacing L = H. The comparison between experimental and numerical results points at the possible application of ddtFoam in geometry with a relatively low level of congestion. This work results proved that simulations in such geometry provide numerical flame acceleration velocity profiles, run-up distance, and recorded overpressures very close to experimentally measured. |
| Databáze: | OpenAIRE |
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