Diffraction of cellular detonation wave over a cylindrical convex wall

Yuan, Xueqiang; Zhang, Jin; Liu, Shijie; Lin, Zhiyong

doi:10.1016/j.actaastro.2019.12.039

Cited by 9 publications

(3 citation statements)

References 38 publications

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“…The agreement obtained with the experiments sup-ports our previous conclusion [9,10] that resolving all the details of the detonation structure are not essential to capture the intricate transients experimentally observed. Finally, our results also support the applicability of GSD modeling [20] or variations thereof [41,42] for the analysis of the current configuration, if one is only interested in capturing the most salient features of the dynamics.…”

Section: Discussionsupporting

confidence: 75%

Dynamics of detonation transmission and propagation in a curved chamber: a numerical and experimental analysis

Melguizo-Gavilanes

Rodriguez

Vidal

et al. 2021

Combustion and Flame

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The dynamics of detonation transmission from a straight channel into a curved chamber was investigated numerically and experimentally as a function of initial pressure (10 kPa ≤ p 0 ≤ 26 kPa) in an argon diluted stoichiometric H 2 -O 2 mixture. Numerical simulations considered the two-dimensional reactive Euler equations with detailed chemistry; hi-speed schlieren and OH* chemiluminescense were used for flow visualization. Results show a rotating Mach detonation along the outer wall of the chamber and the highly transient sequence of events (i.e. detonation diffraction, re-initiation attempts and wave reflections) that precedes its formation. An increase in pressure, from 15 kPa to 26 kPa, expectedly resulted in detonations that are less sensitive to diffraction. The decoupling location of the reaction zone and the leading shock along the inner wall determined where transition from regular reflection to a rather complex wave structure occurred along the outer wall. This complex wave structure includes a rotating Mach detonation (stem), an

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Section: Discussionsupporting

confidence: 75%

Dynamics of detonation transmission and propagation in a curved chamber: a numerical and experimental analysis

Melguizo-Gavilanes

Rodriguez

Vidal

et al. 2021

Combustion and Flame

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“…It can ensure the accuracy of the calculation and improve the efficiency of the calculation. This procedure has been validated in multiple-dimensional detonation simulations [24,25].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Detonation Initiation and Propagation with a Symmetric-Jet in Supersonic Combustible Gas

Linyuan

2022

Aerospace

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In this study, supersonic gaseous detonation initiation and propagation by single- and symmetric-jets are compared, and the effects of symmetric-jets of different intensities on the detonation are further investigated to obtain a more comprehensive understanding of the initiation mechanism of hot jet in supersonic mixtures. The two-dimensional reactive Navier–Stokes equations, together with a one-step Arrhenius chemistry model, are adopted to analyze the flow field structure. The results show that the bow shocks induced by symmetric-jets interacting with each other will achieve local detonation combustion. Influenced by the unstable shear layer behind the triple point, a large-scale vortex shedding is formed in the flow field, thus promoting the consumption of the unburned region. By comparing with the single-jet, it is found that the dual-jet initiation method can shorten the distance to complete initiation, but has little effect on the detonation overdrive degree. In addition, a study of the impact of jet size parameters on the symmetric-jet initiation further revealed that there is a critical value, above which the ignition decreases rapidly which is a significant advantage over single-jet. However, below this threshold, detonation initiation will rely on the energy generated by the collision of Mach stems formed at the walls, resulting in a slower ignition rate compared to a single-jet. Therefore, the use of the appropriate jet strength when using a symmetric-jet will result in a more desirable ignition velocity and a shorter distance to achieve detonation.

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“…With the decrease of mesh size and the higher order accuracy scheme, irregular cellular structure is obtained and unburned gas pockets and circulation structures caused by Kelvin-Helmholtz instability appear behind the detonation front. Xueqiang Yuan [36] analyzed the diffraction of a cellular detonation wave by numerical and theoretical method. They found that diffracted detonation can sustain coupling for a certain distance when propagating over curved wall and curved wall can promote reinitiation and even make detonation propagate stably without decoupling.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Pipe Bending Curvature on H2-O2 Gaseous Detonation Wave Front

Zhao

et al. 2021

Applied Sciences

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The influence of different bend curvatures on the detonation wave propagation was analyzed by an advanced numerical simulation system. The mechanism of propagation properties is revealed by cellular structure, internal and external boundary pressure distribution, propagation process of detonation wave and chemical reaction. The cellular structure and detonation wave front of bend with different curvature are very different. The simulation results show that the detonation wave with regular cell structure propagating through the curved parts induces detonation cell size increased by diffraction near the inner wall while detonation reflected on the bottom surface resulting in decrease of cell size. Detonation wave was affected by the rarefaction wave and compression wave in the bent pipe. The pressure distribution of the bend shows that the peak pressure in the 450 curvature is the largest, which should be paid more attention in industrial design. The chemical reaction could indicate the propagation characteristics of detonation wave, and different propagation characteristics have different profiles of chemical components.

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Diffraction of cellular detonation wave over a cylindrical convex wall

Cited by 9 publications

References 38 publications

Dynamics of detonation transmission and propagation in a curved chamber: a numerical and experimental analysis

Dynamics of detonation transmission and propagation in a curved chamber: a numerical and experimental analysis

Numerical Investigation on Detonation Initiation and Propagation with a Symmetric-Jet in Supersonic Combustible Gas

The Influence of Pipe Bending Curvature on H2-O2 Gaseous Detonation Wave Front

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