1. Suppression of hydrogen-air explosions by isobutene with special molecular structure.
- Author
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Shang, Sheng, Bi, Mingshu, Zhang, Kai, Li, Yanchao, Gao, Zehua, Zhang, Zongling, Li, Xiaolin, Zhang, Changshuai, and Gao, Wei
- Subjects
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MOLECULAR structure , *DUST explosions , *EXPLOSIONS , *REACTIVE oxygen species , *HYDROGEN flames , *OXYGEN consumption - Abstract
Effects of isobutene (i-C 4 H 8) with the unique molecular structure on hydrogen explosions are investigated in a 14 L spherical chamber at 100 kPa and 298 K. The results reveal that for lean hydrogen-air mixtures, the maximum explosion overpressure, maximum pressure rise rate, and deflagration index show a trend from rise to decline. However, for stoichiometric and rich hydrogen-air mixtures, pressure parameters decrease monotonously with increasing i-C 4 H 8. The chemical suppression mechanism of i-C 4 H 8 on hydrogen explosions is revealed in detail by numerical simulation. The relevant analyses show that i-C 4 H 8 can not only change the chain reaction path and cut off the hydrogen-oxygen reaction, but also strengthen the consumption of oxygen and H radicals. This work will provide a novel theoretical foundation for hydrogen explosion prevention and control. [Display omitted] • Effects of i-C 4 H 8 on flame and pressure of hydrogen are observed. • Hydrogen explosions can be effectively suppressed by less than 6.0% i-C 4 H 8. • I-C 4 H 8 can change hydrogen-oxygen chain reaction pathways. • I-C 4 H 8 suppresses hydrogen explosions by enhancing oxygen consumption. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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