Initiation of upstream-directed detonation induced by the venting of gaseous explosion

Medvedev, S. P.; Polenov, A. N.; Khomik, S. V.; Gel’fand, B. E.

doi:10.1016/s0082-0784(06)80630-2

Cited by 10 publications

(5 citation statements)

References 4 publications

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“…A related problem that was studied experimentally is initiation of detonations by turbulent jets [43,[45][46][47][48]. In these experiments, a jet of hot combustion products was injected into an unburned, cold mixture.…”

Section: Experimental Studies Of Ddtmentioning

confidence: 99%

Origins of the deflagration-to-detonation transition in gas-phase combustion

Oran

Gamezo

2007

Combustion and Flame

517

250

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Section: Experimental Studies Of Ddtmentioning

confidence: 99%

Origins of the deflagration-to-detonation transition in gas-phase combustion

Oran

Gamezo

2007

Combustion and Flame

517

250

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“…Furthermore, the presence of the duct has been reported to shorten the distance for deflagration to detonation transition [5]; for very reactive systems, short ducts (using a 4-l test vessel with vent L/D ratio of up to 6) have been observed to be responsible for the onset of upstream directed detonation in the main vessel [6].…”

Section: Introductionmentioning

confidence: 99%

Duct-vented Propaneiair Explosions With Central And Rear Ignition

Ferrara¹,

Benedetto²,

Willacy³

et al. 2005

Fire Safety Science - Proceedings of the Eigth International Sy

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It is commonplace in industrial installations to have duct vented vessels, the design of which is often based upon the premise that central ignition will provide the worst case scenario. This research investigates duct-vented explosions using a vented test chamber of 200 l capacity fitted with a 1m long vent pipe, discharging into a large (50 m 3 ) dump volume with rear and central ignition. Propane-air mixtures over a range of concentrations (Ф=0.8-1.6) have been used. Results show that while there is no significant difference in maximum pressure in the test vessel for rear and central ignition, rear ignition consistently produces the worst case in terms of rates of pressure rise and flame-speeds in the duct. In addition, the detailed records of pressure traces and flame position showed a direct relationship between the induced gas velocity in the duct prior to the flame arrival and the subsequent rate of pressure rise in the vessel. The implications of the findings for practical systems are briefly discussed.

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“…Although duct-vented explosions of hydrocarbons have been extensively investigated, little work has been conducted on hydrogen air mixtures, which is more reactive and prone to transit from deflagration to detonation under suitable conditions [21][22][23]. Kasmani [21] performed experiments on vented hydrogen air mixtures in a 0.5-m-diameter cylindrical vessel with a 0.162-m-diameter duct connected; both the vessel and the duct were 1 m long.…”

Section: Ponizy and Leyermentioning

confidence: 99%

Duct-vented hydrogen–air deflagrations: The effect of duct length and hydrogen concentration

Yang

Guo

Wang

et al. 2018

International Journal of Hydrogen Energy

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Experiments on duct-vented explosions of hydrogen air mixtures in a 12.3 l cylindrical vessel were conducted, and the effects of duct length and hydrogen concentration on the maximum overpressure and flame behavior within and outside the vented enclosure were investigated. The results show that the maximum overpressure in the vessel first increased and then was maintained nearly unchanged with the length of a relief duct increasing to 2 m. For a given duct length, the maximum overpressure first increased and then decreased when hydrogen concentration increased from 20% to 55%. The burn-up in the duct caused the gas mixtures to move in reverse from the duct to vessel, which consequently decreased the venting efficiency. A pressure wave caused by burn-up in the duct was observed, which resulted in a pressure peak in the external pressure time histories after it traveled outside the duct. The maximum external overpressure first increased and then decreased with an increase in duct length. For a given duct length, the maximum external overpressure increased with an increase in hydrogen concentration.

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Initiation of upstream-directed detonation induced by the venting of gaseous explosion

Cited by 10 publications

References 4 publications

Origins of the deflagration-to-detonation transition in gas-phase combustion

Origins of the deflagration-to-detonation transition in gas-phase combustion

Duct-vented Propaneiair Explosions With Central And Rear Ignition

Duct-vented hydrogen–air deflagrations: The effect of duct length and hydrogen concentration

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