On the structure and stability of supersonic hydrogen flames in channels

Киверин, А. Д.; Yakovenko, I. S.; Иванов, М. Ф.

doi:10.1016/j.ijhydene.2016.10.007

Cited by 34 publications

(14 citation statements)

References 55 publications

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“…In most of the cases considered experimentally, one can observe independent self-ignition events taking place at the surface of obstacles ahead of the flame front (see e.g. [13] as well as our calculations published in [15]). The possibility of self-ignition is related to the mixture state achieved in the region of flow deceleration after interaction with the obstacle.…”

Section: Ddt Inside Obstructed Channelsupporting

confidence: 60%

“…For some of the recommendations on the numerical solution of transient combustion regimes, one can refer to our past papers (see e.g. [10,15]). To achieve the goals of this work, we used the computational results obtained with numerical technique elaborated earlier and presented widely in our previous papers (see e.g.…”

Section: Mathematical Model and Problem Setupmentioning

confidence: 99%

“…Herewith, we can assume the Hugoniot compression since the compression inside the reaction zone is realized by the series of compression waves. Actually, at all the stages of flame acceleration, the thermodynamic state of fresh mixture ahead of the flame front changes along the Hugoniot adiabat passing through the initial state point (p 0 , T 0 ) [15,27]. Due to this one can utilize exactly this Hugoniot adiabat for predicting the parameters of the chocked flame.…”

Section: Parametric Study Of Chocked Flame Stabilitymentioning

confidence: 99%

“…It was shown that the detonation forms as a result of simultaneous flame acceleration and pressure rise inside the reaction zone. Recently in [15] the stage of flame evolution prior to DDT was analyzed in details for different initial conditions. It was shown that the realization of particular DDT scenario is determined by the stability of the so-called "chocked flame" regime which is always formed prior to DDT.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of critical conditions for deflagration-to-detonation transition in obstructed channels filled with gaseous mixtures

Киверин

Yakovenko

2018

Math. Model. Nat. Phenom.

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The paper considers the peculiarities of deflagration-to-detonation transition (DDT) in obstructed channels filled with gaseous mixtures. The necessary stage in flame evolution prior to DDT is the stage of flame propagation in so-called “chocked flame” regime. The structure of the chocked flame is studied numerically in details that allows formulating the criterion of its stability. In turn, the stability of chocked flame determines the possibility of further flame acceleration and subsequent DDT. Such a criterion is of purely chemical nature and can be estimated using the parametric study involving simple one-dimensional calculations. It should be however noted that to get the prediction of DDT in real complex geometry one should additionally estimate the particular conditions of chocked flame formation in the given geometry. Moreover, the particular mechanisms of detonation onset should be analyzed. Such a complex analysis involving both chemical criterion and analysis of geometrical conditions is applied to the estimation of DDT possibility in obstructed channels. The obtained results are in a good agreement with available experimental data.

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Section: Ddt Inside Obstructed Channelsupporting

confidence: 60%

Section: Mathematical Model and Problem Setupmentioning

confidence: 99%

Section: Parametric Study Of Chocked Flame Stabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Estimation of critical conditions for deflagration-to-detonation transition in obstructed channels filled with gaseous mixtures

Киверин

Yakovenko

2018

Math. Model. Nat. Phenom.

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“…Governing equations were solved using the explicit euler-lagrangian numerical procedure that was previously successfully applied to solve a wide range of problems of the hydrogen-based gaseous mixtures non-steady combustion processes [36,37,38]. The system of ODEs defining the combustion kinetics was solved by Gear method.…”

Section: Problem Setup and Numerical Methodsmentioning

confidence: 99%

Large-scale flame structures in ultra-lean hydrogen-air mixtures

Yakovenko

Иванов

Киверин

et al. 2018

International Journal of Hydrogen Energy

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The paper discusses the peculiarities of flame propagation in the ultra-lean hydrogen-air mixture. Numerical analysis of the problem shows the possibility of the stable self-sustained flame ball existence in unconfined space on sufficiently large spatial scales. The structure of the flame ball is determined by the convection processes related to the hot products rising in the terrestrial gravity field. It is shown that the structure of the flame ball corresponds to the axisymmetric structures of the gaseous bubble in the liquid. In addition to the stable flame core, there are satellite burning kernels separated from the original flameball and developing inside the thermal wake behind the propagating flame ball. The effective area of burning expands with time due to flame ball and satellite kernels development. Both stable flame ball existence in the ultra-lean mixture and increase in the burning area indicate the possibility of transition to rapid deflagrative combustion as soon as the flame ball enters the region filled with hydrogen-air mixture of the richer composition. Such a scenario is intrinsic to the natural spatial distribution of hydrogen in the conditions of terrestrial gravity and therefore it is crucial to take it into account in elaborating risk assessments techniques and prevention measures.

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Flame propagation behavior of propane–air premixed combustion in a confined space with two perforated plates at different initial pressures

Zhang

Wang

et al. 2022

Energy Science & Engineering

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The aim of this paper is to analyze local autoignition induced by secondary flame acceleration. The secondary flame acceleration process and the local autoignition formation mechanism at the condition of the secondary flame acceleration propagation were investigated by utilizing an improved designed constant volume combustion bomb (CVCB) with two perforated plates. Primary flame and secondary flame propagation were recorded via high‐speed schlieren photography. The results showed that there were three distinct stages in the process of flame propagation through two perforated plates, which were the primary jet flame stage, secondary jet flame stage, and flame‐shock interaction stage. The morphologies of the flame were analyzed by high‐speed Schlieren images, flame velocities, and pressure oscillation including primary jet propagation, secondary flame formation and acceleration, and location autoignition. Results show the effect of initial pressure on flame propagation, flame velocity, and pressure oscillation. Acceleration of secondary flame and local autoignition phenomenon was more precisely demonstrated as unburnt gases were compressed by flame waves (different velocities) with initial pressure increasing. Based on the morphology of flame, three different types of flame combustion modes were captured at different initial pressure involving turbulent flame, deflagration, and quasi‐detonation. The present work might provide a new insight for combustion science in a confined space, such as autoignition due to compression effect of secondary jet flame and primary flame interaction. It also provides the theory guidance and research direction towards further studies on propane storage vessel deflagration.

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On the structure and stability of supersonic hydrogen flames in channels

Cited by 34 publications

References 55 publications

Estimation of critical conditions for deflagration-to-detonation transition in obstructed channels filled with gaseous mixtures

Estimation of critical conditions for deflagration-to-detonation transition in obstructed channels filled with gaseous mixtures

Large-scale flame structures in ultra-lean hydrogen-air mixtures

Flame propagation behavior of propane–air premixed combustion in a confined space with two perforated plates at different initial pressures

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