Effects of vent burst pressure on explosion characteristics of premixed hydrogen-air gases

DU Saifeng; ZHANG Kai; CHEN Hao; GUO Jin; DUAN Zaipeng

doi:10.11883/bzycj-2022-0174

Volume 43 Issue 2

Feb. 2023

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DU Saifeng, ZHANG Kai, CHEN Hao, GUO Jin, DUAN Zaipeng. Effects of vent burst pressure on explosion characteristics of premixed hydrogen-air gases[J]. Explosion And Shock Waves, 2023, 43(2): 025401. doi: 10.11883/bzycj-2022-0174

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DU Saifeng, ZHANG Kai, CHEN Hao, GUO Jin, DUAN Zaipeng. Effects of vent burst pressure on explosion characteristics of premixed hydrogen-air gases[J]. Explosion And Shock Waves, 2023, 43(2): 025401. doi: 10.11883/bzycj-2022-0174

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Effects of vent burst pressure on explosion characteristics of premixed hydrogen-air gases

doi: 10.11883/bzycj-2022-0174

1.
College of Environment and Safety Engineering, Fuzhou University, Fuzhou 350116, Fujian, China
2.
School of Economics and Management, Fuzhou University, Fuzhou 350116, Fujian, China

Received Date: 2022-04-24
Rev Recd Date: 2022-10-11

Available Online: 2022-10-13

Publish Date: 2023-02-25

Abstract

Abstract

By using a self-designed 5.00-m-long duct with a cross-section of 0.30 m × 0.30 m, a seris of experiments were performed on premixed hydrogen-air gases in which volume fraction of hydrogen was 30%. And the effects of vent burst pressure (p_v) on the flame propagation and pressure-time histories in the duct were experimentally iveatigated. The explosion flames were recorded by a high-speed camera at a frequency of 2.5 kHz. Five piezoelectric pressure transducers were employed to record the internal and external overpressure. The duct had been evacuated using a vacuum pump before the experiment, and the premixed hydrogen-air gases with volume fraction of 30% was prepared according to Dalton’s law of partial pressure. The variation of the vent burst pressure was achieved by changing the thickness of the aluminum foil which was used as vent cover. The results show that the first three stages of the flame structure in the duct are hemispherical, finger-shaped and tulip flame, respectively. p_v has a significant effect on the structure of tulip flame and its subsequent development. Three pressure peaks (p_b, p_out, p_ext) can be distinguished from the pressure-time histories monitored by the pressure transducer near the vent, corresponding to three different generation mechanisms: burst of the aluminum film, venting of burned mixtures, and the external explosion, respectively. The three pressure peaks increase with an increase in p_v. p_bis the dominant pressure peak in most cases. The maximum internal overpressure increases as p_v increases, and the position where the maximum internal overpressure was measured depended on p_v. The maximum internal overpressure was obtained at the center of the duct (PT2) when p_v≤42 kPa, but near the open end of the duct (PT3) if p_v>42 kPa. When the flame reached the vent, it ejected from the vent and then ignited the external combustible cloud. Therefore, the external explosion is triggered. p_v significantly affects the flame evolution outside the duct, but there is no significant difference in the maximum length of the external flame at various p_v. A non-monotonic trend between the maximum external overpressure and p_v was observed.
- hydrogen,
- vent burst pressure,
- flame propagation,
- explosion overpressure,
- external explosion

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References(36)

References

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