The influence of cellular structure on detonation transmission

Jones, David A.; Kemister, G.; Oran, E. S.; Sichel, Martin

doi:10.1007/s001930050028

Cited by 7 publications

(13 citation statements)

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“…Even a thin 30 nm collodion film separating the primary and bounding mixture was able to block this process (Liu et al 1988). Jones et al (1996) performed numerical simulations of these experiments for a mixture of H 2 -O 2 heavily diluted with Ar and showed that direct reignition fails when the transverse waves in the detonation in the primary explosive are suppressed, as also observed experimentally. repeated these calculations for a stoichiometric H 2 -O 2 mixture with a more accurate chemical model, still not resolving transverse waves, and again did not observe direct reignition.…”

Section: Introductionmentioning

confidence: 57%

“…We show that reignition occurs by one of two mechanisms, depending on the initial conditions of the simulation. The first mechanism is similar to that observed in H 2 -O 2 -Ar by Jones et al (1996) and involves the collision of triple points as they expand along the decaying shock front. In the second mechanism ignition occurs as a result of the coalescence of a number of small hot spots.…”

Section: Introductionmentioning

confidence: 68%

“…repeated these calculations for a stoichiometric H 2 -O 2 mixture with a more accurate chemical model, still not resolving transverse waves, and again did not observe direct reignition. However, when Jones et al (1996) resolved the transverse wave structure for H 2 -O 2 -Ar the simulations showed direct reignition of the detonation in the secondary explosive. The form of this reignition showed striking similarities to the reignition seen experimentally in undiluted H 2 -O 2 mixtures.…”

Section: Introductionmentioning

confidence: 97%

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Numerical simulation of detonation reignition in H $_2$ -O $_2$ mixtures in area expansions

et al. 2000

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Time-dependent, two-dimensional, numerical simulations of a transmitted detonation show reignition occuring by one of two mechanisms. The first mechanism involves the collision of triple points as they expand along a decaying shock front. In the second mechanism ignition results from the coalescence of a number of small, relatively high pressure regions left over from the decay of weakened transverse waves. The simulations were performed using an improved chemical kinetic model for stoichiometric H2-O2 mixtures. The initial conditions were a propagating, two-dimensional detonation resolved enough to show transverse wave structure. The calculations provide clarification of the reignition mechanism seen in previous H2-O2-Ar simulations, and again demonstrate that the transverse wave structure of the detonation front is critical to the reignition process.

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Section: Introductionmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 97%

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Numerical simulation of detonation reignition in H $_2$ -O $_2$ mixtures in area expansions

et al. 2000

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“…Simulation studies with adaptive mesh refinement to resolve the cellular structure and a two-step chemistry model for the transmission from small channel to a larger area of a stable detonation with regular cellular pattern have shown decoupling of the reaction zone from the shock front and diffraction. A higher cell number than normal is required for stable detonation transmission (Jones et al, 1996;Li et al, 2016) and our simulated OH* images revealed a smaller number of cells immediately before detonation expanding through the nozzle, which could be related to the dilution effect at the interface of the two computational regions.…”

Section: Evaluation Of the Simulation Resultsmentioning

confidence: 78%

2-D Simulation with OH* Kinetics of a Single-Cycle Pulse Detonation Engine

Maciel

Marques²

2019

JAFM

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Two-dimensional computational fluid dynamics (CFD) simulation with selected kinetics for H2-air mixture of a hydrogen-fuelled single-pulse detonation engine were performed through ANSYS FLUENT commercial software for diagnostic purposes. The results were compared with Chapman-Jouguet (CJ) values calculated by the CEA (Chemical Equilibrium with Applications) and ZND (Zel'dovich-Neumann-Döring) codes. The CJ velocities and pressures, as the product velocities are in agreement, however, the CJ temperatures are too higher for 2-D simulations; as a consequence, the sound velocities were overpredicted. OH* kinetics added to the reaction set allowed visualization of the propagation front with several detonation cells showing a consistent multi-headed detonation propagating in the whole tube. The detonation front was slightly perturbed at the end of the tube with inclination of front edge and fewer cell numbers, and more significantly at the nozzle entrance with velocity reduction, resulting in a weak and unstable detonation. OH* images showed the detonation reaction zone decoupled from the shock front with disappearance of cellular structure. The inclusion of OH* reaction set for CFD simulation coupled to kinetics is demonstrated to be an excellent tool to follow the detonation propagation behaviour.

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“…Another way is to use detonation diffraction phenomena that may quench a detonation propagating from a smaller to a larger channel [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. For example, inserting a cylindrical expansion section of a larger diameter into a pipeline may stop a detonation if the pipeline diameter is small enough.…”

Section: Introductionmentioning

confidence: 99%

Unidirectional Propagation of Gas Detonations in Channels with Sawtooth Walls

Gamezo¹,

Oran²

2010

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The influence of cellular structure on detonation transmission

Cited by 7 publications

References 0 publications

Numerical simulation of detonation reignition in H $_2$ -O $_2$ mixtures in area expansions

Numerical simulation of detonation reignition in H $_2$ -O $_2$ mixtures in area expansions

2-D Simulation with OH* Kinetics of a Single-Cycle Pulse Detonation Engine

Unidirectional Propagation of Gas Detonations in Channels with Sawtooth Walls

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