Air blast and heat radiation from fuel-rich mixture detonations

Dorofeev, S.B.; Sidorov, V.P.; Кузнецов, М.; Dvoinishnikov, A. E.; Алексеев, В. И.; Ефименко, А.А.

doi:10.1007/bf02511401

Cited by 15 publications

(15 citation statements)

References 5 publications

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“…The gradient concept proposed by Zeldovich et al is more general and also allows the detonation to form when a spontaneous wave decelerates from higher velocities to D CJ (see [58] for more details). Now there is substantial experimental and theoretical evidence that a detonation can develop in a reactivity gradient [30,32,54,55,57,58,[60][61][62]. Nevertheless, the relation of this mechanism to detonation ignition in a turbulent flame brush was not at all certain when we began this project.…”

Section: Theoretical and Numerical Studiesmentioning

confidence: 98%

“…Many past analyses [30,32,54,55,57,58,[60][61][62] have shown that there are also critical conditions for the gradient of τ c and the size of the hot spot. If the distribution of τ c does not meet these conditions, the detonation does not develop, and the spontaneous wave degenerates into a shock and a residual flame.…”

Section: The Role and Structure Of Hot Spotsmentioning

confidence: 99%

“…21). The wave on the left is smooth, which is typical of spontaneous waves discussed extensively in the literature (for example, [30,32,[60][61][62]). At 1.2527 ms, the spontaneous waves have already undergone transition to detonation and there are two shocks propagating in opposite directions.…”

Section: The Role and Structure Of Hot Spotsmentioning

confidence: 99%

“…Two basic scenarios of DDT were observed: sometimes it happened inside the region containing the turbulent flame, and sometimes it occurred in the preheated, compressed material between the leading shock wave and the flame. A substantial body of experimental work has since shown that the presence of obstacles along the walls of the channels results in much faster flame acceleration and transition to a detonation than if no obstacles were present (see, for example, [29][30][31][32][33][34]). …”

Section: Experimental Studies Of Ddtmentioning

confidence: 99%

See 3 more Smart Citations

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

Oran

Gamezo

2007

Combustion and Flame

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250

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Section: Theoretical and Numerical Studiesmentioning

confidence: 98%

Section: The Role and Structure Of Hot Spotsmentioning

confidence: 99%

Section: The Role and Structure Of Hot Spotsmentioning

confidence: 99%

Section: Experimental Studies Of Ddtmentioning

confidence: 99%

See 2 more Smart Citations

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

Oran

Gamezo

2007

Combustion and Flame

518

250

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“…Left liquid alone (# U04281B); middle dry Al particles alone (# U04328B); and right an Al particle-liquid hybrid mixture (# U04308A). Timings from top to bottom are 5, 10, 25, and 50 ms [8] a gasoline, kerosene or diesel fuel canister weighing 0.1-100 metric tons [3,4]; and reported by Zhang et al [5] for a quarter-cylindrical cloud of aluminum particles, 230 m 3 in volume and 4 m in radius. The results show that the gasoline spray, after a sufficiently long suspension time, requires a critical TNT charge mass of 0.64 kg to initiate detonation [1,2].…”

Section: Introductionmentioning

confidence: 99%

Large-scale spray detonation and related particle jetting instability phenomenon

et al. 2014

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The detonation performance of a more than 70,000 m 3 fuel spray-air cloud is experimentally investigated using dispersal of a 5,090 kg gasoline payload by a central explosive in a cylindrically stratified configuration. The large-scale explosive dispersal data are further analyzed, together with a revisit of the data from previously conducted small-scale experiments and numerical simulations, to study particle jetting instabilities. The experiments depict a dual hierarchical jet structure consisting of primary particle jets overlapped by fine particle jets on the primary surfaces. Both jet systems form within the expansion of 1.5-2 times the initial charge diameter. The fine droplet jets are numerous initially as a result of surface instabilities or fragmentation of the charge casing, while the primary jets have a limited number emerging out of the surface of fine jet structures later in time. The number of primary jets is consistent with the number of incipient radial fractures observed at the payload surface. From this fact, an instability mechanism is suggested that the formation of primary particle jets may originate in the perturbations that develop near the interior interface between explosive and payload, through non-uniform density effects or casing fragmentation, driven by the explosive detonation and subsequent expansion of the high-pressure detonation products. Numerical modeling using liquid payload fragmenting into droplet particles has been applied to investigate the proposed mechanism. The numerical results show that the high-pressure jets of detonation products, created from the interior casing fragmentation, radially fracture the payload. The resulting compressed radial filaments, developed within the payload, lead to the primary jets emerging between the radial fracture points at the payload surface. The number of interior payload filaments before payload surface bursting, and hence the number of primary jets, is controlled by the number of inner casing fragments at the explosivepayload interface. Furthermore, the number of primary jets is also influenced by the mass ratio of payload to explosive and inner casing fragment pattern, whereas the perturbations induced by minor fragments will dissipate through the large payload and not result in final filaments.

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Spray Detonation

Zhang¹

2009

Shock Wave Science and Technology Reference Library

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Air blast and heat radiation from fuel-rich mixture detonations

Cited by 15 publications

References 5 publications

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

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

Large-scale spray detonation and related particle jetting instability phenomenon

Spray Detonation

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