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I. Brailovsky
Tel Aviv University
Deflagration to detonation transitionCombustionChemistryDetonationThermodynamics
26Publications
10H-index
312Citations
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Publications 26
Newest
#1I. Brailovsky (TAU: Tel Aviv University)H-Index: 10
#2L. Kagan (TAU: Tel Aviv University)H-Index: 11
Last. Gregory I. Sivashinsky (TAU: Tel Aviv University)H-Index: 29
view all 4 authors...
The paper is concerned with the experimentally known phenomenon that the detonation velocity of a tubular charge may markedly exceed that of a homogeneous charge of the same explosive. It is shown ...
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#1I. Brailovsky (TAU: Tel Aviv University)H-Index: 10
#2Gregory I. Sivashinsky (TAU: Tel Aviv University)H-Index: 29
This paper is concerned with detonation-propelled shocks (precursors) occurring in gas-permeable charges. It is shown that the basic aspects of the event may successfully be reproduced within a one-dimensional two-phase picture widely employed in the modelling of porous energetic materials. Precursor shocks are sustained by intense gasification of the solid phase, provided the ignition pressure (Pign) exceeds a certain critical level. At high enough Pign, the post-shock flow is found to acquire ...
1 CitationsSource
#1I. Brailovsky (TAU: Tel Aviv University)H-Index: 10
#2Peter V. Gordon (University of Akron)H-Index: 8
Last. Gregory I. Sivashinsky (TAU: Tel Aviv University)H-Index: 29
view all 4 authors...
Abstract This study is motivated by the observation that in combustion of hydrogen–oxygen/air and ethylene–oxygen mixtures the global activation energy appears to be high at low enough temperatures and low at high enough temperatures, reflecting the complex nature of the underlying chemistry. Stability analysis of a uniformly propagating planar premixed flame controlled by a stepwise ignition-temperature kinetics (representing the activation energy temperature-dependence) is carried out. It is s...
5 CitationsSource
#1I. Brailovsky (TAU: Tel Aviv University)H-Index: 10
#2Gregory I. Sivashinsky (TAU: Tel Aviv University)H-Index: 29
The paper is concerned with the channel effect: detonation-propelled shocks occurring in tubular charges. It is shown that some salient aspects of the phenomenon may be successfully reproduced within a simple one-dimensional model assuming the gas–solid system to be isothermal and the volume fraction of the solid phase to be small. Two modes of the channel effect, dependent on the level of the ignition pressure, are identified. Although the emerging detonations appear to be of the Chapman–Jougue...
2 CitationsSource
#1I. Brailovsky (TAU: Tel Aviv University)H-Index: 10
#2Gregory I. Sivashinsky (TAU: Tel Aviv University)H-Index: 29
Abstract The article is concerned with the experimentally known phenomenon of the precursor shock driven by the detonation of a tubular charge. It is shown that the basic aspects of the effect may be successfully captured within a one-dimensional two-phase version of the Chapman–Jouguet (CJ) theory. A modified CJ principle for determination of the detonation and precursor shock velocities is discussed.
3 CitationsSource
#1I. Brailovsky (TAU: Tel Aviv University)H-Index: 10
#2L. Kagan (TAU: Tel Aviv University)H-Index: 11
Last. Gregory I. Sivashinsky (TAU: Tel Aviv University)H-Index: 29
view all 3 authors...
The effects of hydraulic resistance on the burning of confined/obstacle-laden gaseous and gas-permeable solid explosives are discussed on the basis of recent research. Hydraulic resistance is found to induce a new powerful mechanism for the reaction spread (diffusion of pressure) allowing for both fast subsonic as well as supersonic propagation. Hydraulic resistance appears to be of relevance also for the multiplicity of detonation regimes as well as for the transitions from slow conductive to f...
20 CitationsSource
#1I. Brailovsky (TAU: Tel Aviv University)H-Index: 10
#2Michael L. Frankel (IUPUI: Indiana University – Purdue University Indianapolis)H-Index: 11
Last. Gregory I. Sivashinsky (TAU: Tel Aviv University)H-Index: 29
view all 4 authors...
The experimentally known phenomenon of oscillatory instability in convective burning of porous explosives is discussed. A simple phenomenological model accounting for the ejection of unburned particles from the consolidated charge is formulated and analyzed. It is shown that the post-front hydraulic resistance induced by the ejected particles provides a mechanism for the oscillatory burning.
1 CitationsSource
#1I. Brailovsky (TAU: Tel Aviv University)H-Index: 10
#2L. Kagan (TAU: Tel Aviv University)H-Index: 11
Last. Gregory I. Sivashinsky (TAU: Tel Aviv University)H-Index: 29
view all 3 authors...
Abstract The piston–flow interaction induced by a piston pushing hydraulically resisted gas through a long tube is discussed. It is shown that the hydraulic resistance causes a significant precompression and preheating of the gas adjacent to the piston’s edge. In the case of an explosive premixture this development may lead to a localized autoignition triggering detonation. It is suggested that the problem may serve as a guide for understanding the deflagration-to-detonation transition in tubes,...
2 CitationsSource
#1I. Brailovsky (TAU: Tel Aviv University)H-Index: 10
#2Peter V. Gordon (NJIT: New Jersey Institute of Technology)H-Index: 8
Last. Gregory I. Sivashinsky (TAU: Tel Aviv University)H-Index: 29
view all 3 authors...
Abstract Departing from the classical Burke–Schumann theory for diffusion flames, a reduced model for the description of the evolving wave front in forward smoldering is derived. The model is then used to describe the fingering instability induced by the increase in porosity, which results from the solid fuel depletion. The cusp-leading nature of the fingering pattern is revealed, which is opposite to the cusp-trailing structure typical of premixed gas cellular/wrinkled flames.
5 CitationsSource
#1Alexander Joseph Babchin (Alberta Research Council)H-Index: 4
#2I. Brailovsky (TAU: Tel Aviv University)H-Index: 10
Last. Gregory I. Sivashinsky (TAU: Tel Aviv University)H-Index: 29
view all 4 authors...
Departing from the classical Buckley-Leverett theory for two-phase immiscible flows in porous media, a reduced evolution equation for the water-oil displacement front is formulated and studied numerically. The reduced model successfully reproduces the basic features of the finger-forming dynamics observed in recent direct numerical simulations.
16 CitationsSource
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