The propagation mechanism of high speed turbulent deflagrations

Chao, Jenny; Lee, J.H.S.

doi:10.1007/s00193-002-0161-2

Cited by 49 publications

(22 citation statements)

References 16 publications

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“…A similar sharp decline was observed for natural gas-air, beyond the end of pipework obstacles, by Harris & Wickens [24]. Localized autoignitions became more probable with stoichiometric propane-air and a more stable quasi-detonation regime was observed in [18]. The measured quasi-detonation speed was 1400 m s −1 at a blockage ratio of 0.41, less than the theoretical CJ speed of 1802 m s −1 , and the pressure ratio was just over 8.…”

Section: Phil Trans R Soc a (2012)supporting

confidence: 78%

“…Many stoichiometric mixtures, initially under atmospheric conditions, can attain turbulent flame speeds that are comparable to Chapman-Jouguet (CJ) detonation speeds. Chao & Lee [18] have measured such turbulent flame speeds in ducts that are closed at one end and packed with cylindrical rods to accelerate the flame. These flame speeds also depended upon the blockage ratio.…”

Section: Deflagrationmentioning

confidence: 99%

See 1 more Smart Citation

Large vapour cloud explosions, with particular reference to that at Buncefield

Bradley

Chamberlain

Drysdale

2012

Phil. Trans. R. Soc. A.

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This paper first briefly surveys the energy releases in some major accidents. It then examines the analyses of the explosion at the Buncefield fuel storage site in the UK, one of the most intense accidental explosions in recent times. This followed the release of approximately 300 tonnes of winter-grade gasoline, when a 15 m high storage tank was overfilled for about 40 min before ignition of the resulting flammable mixture. The ensuing explosion was of a severity that had not been identified previously in a major hazard assessment of this type of facility. It was therefore imperative to investigate the event thoroughly and develop an understanding of the underlying mechanisms to inform future prevention, mitigation and land-use planning issues. The investigation of the incident was overseen by the Buncefield Major Incident Investigation Board. A separate Explosion Mechanism Advisory Group examined the evidence and reported on the severity of the explosion. It concluded that additional work was necessary and recommended that a two-stage project be initiated, phase 1 of which has been completed. The analyses of the damage and the derivation of explosion over-pressures are described. Possible explosion mechanisms and the evidence for them at Buncefield are discussed, in the light of other major incidents. Mechanisms that are reviewed include high-speed turbulent combustion, quasi-detonations, fully developed detonations, the generation of fireballs, flame instabilites, radiative heat transfer and aspects of two-phase burning. Of particular importance is the acceleration of turbulent flames along the line of trees and hedgerows. A number of conclusions are drawn and suggestions made for further research.

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Section: Phil Trans R Soc a (2012)supporting

confidence: 78%

Section: Deflagrationmentioning

confidence: 99%

Large vapour cloud explosions, with particular reference to that at Buncefield

Bradley

Chamberlain

Drysdale

2012

Phil. Trans. R. Soc. A.

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“…2a and c, respectively. Chao and Lee performed experiments in a 300 mm square cross-section channel with staggered 3.4 cm diameter cylinders where the final steady combustion front velocity was reported [16]. Steady-state propagation regimes were found to be slightly different from those observed in a circular tube equipped with an array of orifice plates with the same blockage ratio.…”

Section: Introductionmentioning

confidence: 92%

Combustion wave propagation through a bank of cross-flow cylinders

Pinos

Ciccarelli

2015

Combustion and Flame

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“…[1][2][3][4][5] There have also been numerous studies on the effect of obstacles on combustion processes such as flame propagation or detonation to deflagration transition (DDT). [6][7][8][9] While these do explore the propagation regimes of such phenomena using orifice plates, they do not directly relate to the present study where the limits of a self-propagating detonation in a "rough" tube are investigated. It should also be noted that repeated orifice plates used as obstacles in the previous studies differ from the Shchelkin spiral used as roughness in the present study, especially if the wire diameter is not large.…”

Section: General Overviewmentioning

confidence: 99%