Effect of vent area on vented deflagration of hydrogen–methane–air mixtures
| Autor: | Wei Liu, Su Zhang, Jin Guo, Jiaqing Zhang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology 02 engineering and technology Mechanics 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Overpressure Fuel Technology Deflagration Duct (flow) 0210 nano-technology Hydrogen+Methane Pressure buildup |
| Zdroj: | International Journal of Hydrogen Energy. 46:6992-6999 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2020.11.123 |
| Popis: | In this study, experiments on the vented deflagration of hydrogen–methane–air mixtures were performed in a vertical rectangular duct with a vent at its top end. A nondimensional vent coefficient ( K v ) was employed to characterize the effects of vent area ( A v ) on flame evolution and pressure buildup within and outside the duct. The maximum internal overpressure was attained near the duct bottom for a certain K v . As K v was increased from 2.2 to 11.9, the maximum internal overpressure near the vent and at the center of the duct increased monotonically; however, a nonmonotonic trend was observed at the duct bottom. Helmholtz oscillations of the internal flame and overpressure were observed in the tests for low K v , and acoustic oscillations of the internal overpressure with a frequency of ~1200 Hz appeared in all tests. The maximum external overpressure first increased and then decreased with an increase in K v . The external explosion induced a pressure peak in the duct, and the effect of external explosion on the venting of the internal deflagrations was weakened as K v ≥ 7.8. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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