Influence of water droplets on propagating detonations

Niedzielska, Urszula; Kapusta, Łukasz Jan; Savard, Bruno; Teodorczyk, A.

doi:10.1016/j.jlp.2017.10.003

Cited by 15 publications

(5 citation statements)

References 16 publications

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“…They also find that the water droplet size and loading densities are crucial to quenching a detonation. It is observed by Niedzielska et al [15] that small (215 µm in their experiments) droplets with fast evaporation rate has strong influence on detonation quenching. Moreover, from detonation tube experiments, Jarsalé et al [16] observe that presence of water spray drastically alters the detonation cell size, but the ratio of the hydrodynamic thickness to the cell size remain constant, regardless of water droplet addition.…”

Section: Introductionmentioning

confidence: 81%

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Extinction of incident hydrogen/air detonation in fine water sprays

Zhao

Zhang

2021

Physics of Fluids

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Two-dimensional numerical simulations with Eulerian-Lagrangian method are conducted to study propagation and extinction of stoichiometric hydrogen/air detonations in fine water sprays. Parameterized by water mass loading and initial droplet size, a detonation extinction map is developed. Detonation extinction would occur with larger mass loading and/or smaller droplet size. General features of gas phase and water droplets and local detonation frontal structures are well captured. Numerical soot foils are used to characterize the influence of mass loading and droplet size on the detonation wave. The results also show that the detonation cell size increases with increased mass loading or decreased droplet size. Analysis on unsteady detonation extinction process is performed with the evolutions of detonation frontal structure, spatial distribution of thermochemical variables and interphase transfer rates (mass, energy, and momentum). Moreover, the chemical explosive mode analysis reveals that for stable detonation, thermal runaway dominates behind the Mach stem, while chemical propensities of auto-ignition and thermal runaway appear alternately behind the incident wave. When the induction zone length increases as the reaction front (RF) and shock front (SF) are decoupled, localized burned pockets surrounded by the autoignition chemical explosive mode can be observed. In addition, the interactions between detonation wave and water droplets demonstrate that the energy and momentum transfer have more direct interaction with SF and RF than the mass transfer. The interphase transfer rates increase with the water mass loading. Under the same mass loading, the smaller the droplet size, the larger the interphase transfer rates. However, the size of fine water droplets has a limited influence on the interphase momentum exchange. Moreover, high energy and mass transfer rates are observed at the onset of detonation extinction, and they gradually decrease when the reaction and detonation fronts are decoupled.

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Section: Introductionmentioning

confidence: 81%

“…Besides the foregoing experimental work [8,[14][15][16], recent computational efforts provide us more insights on detonation in water sprays. For example, Song and Zhang simulate the methane detonation and find that the inhibition effects of water sprays are mainly reflected in reduction of flame temperature [7].…”

Section: Introductionmentioning

confidence: 99%

Extinction of incident hydrogen/air detonation in fine water sprays

Zhao

Zhang

2021

Physics of Fluids

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Effect of water droplet breakup on hydrogen/air detonations

Zhao

Zhang

2021

ICLASS

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Two-dimensional numerical simulations with Eulerian-Lagrangian method are conducted to study the influence of fine water droplet breakup on detonation propagation in stoichiometric hydrogen/air mixture. General features of gas phase and water droplets are well captured. Numerical soot foils are used to characterize the influence of droplet breakup on the detonation wave, and the results confirm that droplet disintegration make propagation detonation wave more stable under the studied conditions. Analysis on unsteady detonation propagation process is performed with the evolutions of spatial distribution of interphase transfer rates (mass, energy, and momentum). The interactions between detonation wave and water droplets demonstrate that the breakup model have more pronounced influence on mass and energy transfer than the momentum transfer. Moreover, high interphase transfer rates of disintegration case are observed at the onset of detonation propagation, and they gradually decrease. It is concluded that inclusion of droplet breakup significantly alters propagation and two-phase coupling of the gaseous detonation in fine water mists.

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“…Water spray can be used in the mitigation process of detonation, as demonstrated by Gerstein et al [2] and also Thomas et al [3] using fine sprays. However, Niedzielska et al [4] arrived at the same conclusion with a coarser spray. In addition, Thomas [5] argued that larger droplets can be active as they can generate smaller droplets by breakup.…”

Section: Introductionmentioning

confidence: 83%