Transitional regimes of wave propagation in metastable systems

Смирнов, Н.Н.; Никитин, В. Ф.; Alyari-Shourekhdeli, Sh.

doi:10.1007/s10573-008-0080-3

Cited by 30 publications

(3 citation statements)

References 22 publications

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“…The validation of the numerical model was performed by comparing the cell size numerically obtained for the stoichiometric hydrogen-air mixture using different kinetic mechanisms with the results of experimental measurements obtained by different authors [35,36]. The instability of the leading shock wave was also verified by studying dispersed-film and other metastable systems [37,38].…”

Section: Numerical Modelmentioning

confidence: 99%

Mathematical Modeling of the Hydrodynamic Instability and Chemical Inhibition of Detonation Waves in a Syngas–Air Mixture

Nikitin,

Mikhalchenko,

Stamov

et al. 2023

Mathematics

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This paper presents the results of the two-dimensional modeling of the hydrodynamic instability of a detonation wave, which results in the formation of an oscillating cellular structure on the wave front. This cellular structure of the wave, unstable due to its origin, demonstrates the constant statistically averaged characteristics of the cell size. The suppression of detonation propagation in synthesis gas mixtures with air using a combustible inhibitor is studied numerically. Contrary to the majority of inhibitors being either inert substances, which do not take part in the chemical reaction, or take part in chemical reaction but do not contribute to energy release, the suggested inhibitor is also a fuel, which enters into an exothermic reaction with oxygen. The unsaturated hydrocarbon propylene additive is used as an inhibitor. The dependence of the effect of the inhibitor content on the mitigation of detonation for various conditions of detonation initiation is researched. The results make it possible to determine a critical percentage of inhibitor which prevents the occurrence of detonation and the critical percentage of inhibitor which destroys a developed detonation wave.

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Section: Numerical Modelmentioning

confidence: 99%

Mathematical Modeling of the Hydrodynamic Instability and Chemical Inhibition of Detonation Waves in a Syngas–Air Mixture

Nikitin,

Mikhalchenko,

Stamov

et al. 2023

Mathematics

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“…In most cases, the turbulent transport supersedes the molecular, and the last is made using simplified technique using constant Prandtl Pr and Schmidt Sc numbers hypothesis [13]:…”

Section: Turbulence Model and Transportmentioning

confidence: 99%

3D Problems of Rotating Detonation Wave in a Ramjet Engine Modeled on a Supercomputer

Никитин

Filippov

Стамов

et al. 2018

JSFI

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A rotating detonation engine (RDE) combustion chamber was modeled in the work numerically using 3D geometry. The RDE is a new type of engines capable to create higher thrust than the traditional ones, which are based on the combustible mixture deflagration process. In the numerical experiment, different scenarios of the engine performance were obtained. The calculations were made at a compact supercomputer APK-5 with a peak performance of 5.5 Tera Flops.

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“…It has been reported that cavities can help realize detonation initiation through the DDT mechanism, and an increase in the number of cavities promotes DDT as long as the flame velocity leaving the last cavity does not exceed the sonic velocity [69] [70] .…”

Section: Cavity-based Initiationmentioning

confidence: 99%

Adaptive simulations of cavity-based detonation in supersonic hydrogen–oxygen mixture

Cai

Liang

Deiterding

et al. 2016

International Journal of Hydrogen Energy

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Two-dimensional reactive Euler equations with a detailed reaction modelwhere the molar ratio of the combustible mixture H2/O2/Ar is 2:1:7 under the condition of pressure 6.67 kPa and temperature 298 K, are solved numerically with adaptive mesh refinement method to investigate detonation combustion using a hot jet initiation in cavity-based channels filled with the supersonic combustible mixture.Results show that from the comparison between the simulations in a cavity-based channel and a straight channel without any cavity embedded, it is indicated that the cavity can help realize detonation initiation in the combustible mixture with a hot jet.It is suggested that detonation initiation can be realized using a relatively weaker hot jet in cavity-based channels filled with the supersonic combustible mixture compared with that in straight channels without a cavity embedded. The cavity also plays a significant role in detonation propagation in the supersonic combustible mixture.After the hot jet is shut down, the acoustic wave generated by the subsonic combustion in the cavity can accelerate detonation propagation through a subsonic Corresponding author. Email addresses: cai-chonger@hotmail.com, jhleon@vip.sina.com, r.deiterding@soton.ac.uk, linzy96@nudt.edu.cn, channel and result in the formation of a slightly overdriven detonation eventually. For a given flow with a shadow cavity embedded, there should exist a minimum cavity width Lmin. When the width is below Lmin, only some pressure oscillations in the cavity can make some impacts on detonation initiation and propagation. Otherwise, cavity oscillations can be generated which can greatly accelerate detonation initiation and propagation in the supersonic combustible mixture. For the shadow cavity, purely increasing the cavity depth does not have any more influence on detonation combustion. However, if the cavity is a deep one, it can play an important role in accelerating detonation initiation and propagation in the supersonic combustible mixture due to resonant oscillations.

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Transitional regimes of wave propagation in metastable systems

Cited by 30 publications

References 22 publications

Mathematical Modeling of the Hydrodynamic Instability and Chemical Inhibition of Detonation Waves in a Syngas–Air Mixture

Mathematical Modeling of the Hydrodynamic Instability and Chemical Inhibition of Detonation Waves in a Syngas–Air Mixture

3D Problems of Rotating Detonation Wave in a Ramjet Engine Modeled on a Supercomputer

Adaptive simulations of cavity-based detonation in supersonic hydrogen–oxygen mixture

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