External explosions of vented hydrogen-air deflagrations in a cubic vessel

Rui, Shengchao; Wang, Changjian; Luo, Xianqi; Rulin, Jing; Quan, Li

doi:10.1016/j.fuel.2021.121023

Cited by 21 publications

(7 citation statements)

References 37 publications

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“… 64 After breaking the film, the flame promoted the combustion gas to rush out of the channel quickly, and then refluxed quickly, triggering Helmholtz oscillation. 1 , 21 …”

Section: Resultsmentioning

confidence: 99%

“…With the drying out of traditional energy and growth of global energy demand, environmental problems and greenhouse effect had become increasingly serious. 1 Therefore, hydrogen is gaining more attention because of its long-lasting ability, high calorific value, and nonpolluting nature. 2 − 6 However, hydrogen also has a larger flammable limit range and is prone to form the risk of pre-ignition and explosion.…”

Section: Introductionmentioning

confidence: 99%

“…By conducting hydrogen–air explosion experiments in a 2.3 m diameter spherical vessel with a hydrogen concentration range of 6–20 vol%, Kumar et al 28 concluded that the effect of venting on the peak overpressure was different at different hydrogen concentrations. The influences of the ignition position on the explosion overpressure were explored by Rui et al 1 with different hydrogen concentrations. The results showed that the ignition position had almost no influence on explosion overpressure at low concentrations.…”

Section: Introductionmentioning

confidence: 99%

“…With the drying out of traditional energy and growth of global energy demand, environmental problems and greenhouse effect had become increasingly serious . Therefore, hydrogen is gaining more attention because of its long-lasting ability, high calorific value, and nonpolluting nature. − However, hydrogen also has a larger flammable limit range and is prone to form the risk of pre-ignition and explosion. − Once hydrogen leaks, it could trigger an explosion, especially in confined spaces, which might generate an overpressure of several atmospheres. , Therefore, it is necessary to fully evaluate the safety problems in hydrogen utilization and prefect the explosion database, so as to guide the engineering practice. , …”

Section: Introductionmentioning

confidence: 99%

“…It has been established that many factors affected the explosion characteristics. The common influencing factors included obstacle, , initial turbulence, vent burst pressure, , ignition position, ,, initial pressure, vent area, equivalence ratio, , and so forth. Exploring the impact results of these factors brought a deeper understanding of hydrogen–air explosion.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Studies on the Explosion Behaviors of Premixed Hydrogen–Air Mixtures in a Narrow Channel

Zhang

Wen

et al. 2022

ACS Omega

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Premixed hydrogen–air explosion experiments were carried out in a 1000 mm × 50 mm × 10 mm half-open narrow channel, concerning with the influences of equivalence ratio and ignition position on explosion behaviors. Experimental phenomena were different from explosion in large space. The results indicated that when ignited at the closed end of the channel, three overpressure peaks appeared, caused by the rupture of the film, Helmholtz Oscillation, and the flame-acoustic interaction, respectively. As the equivalence ratio of the hydrogen–air mixtures varied from 0.6 to 1.6, the peak overpressure first increased and then decreased. The maximum peak overpressure occurred at ϕ = 1.2. The hydrogen flame would develop into the plane tulip structure without the influence of the end wall. With the ignition position moved to the open end, overpressure wave and flame oscillated significantly. Compared with other ignition positions, the minimum value of P max was obtained at IP 950 . Based on the explosion behaviors in the narrow channel, it was concluded that the closer the ignition was to the open end, the easier the oscillation was to be formed, the smaller the explosion hazard was.

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“… 64 After breaking the film, the flame promoted the combustion gas to rush out of the channel quickly, and then refluxed quickly, triggering Helmholtz oscillation. 1 , 21 …”

Section: Resultsmentioning

confidence: 99%