Mechanism of transition to detonation in unconfined volumes

Киверин, А. Д.; Yakovenko, I. S.

doi:10.1016/j.actaastro.2020.02.013

Cited by 18 publications

(5 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, the chosen numerical technique is thoroughly validated for hydrogen–air flames in [ 25 ]. Moreover, it reproduces the non-steady effects in flame development well and predicts with high accuracy such a phenomenon as the deflagration-to-detonation transition [ 27 ] (the calculations agree well with the available experimental data). Although a numerical technique with low dissipation is used, one should resolve the reaction zone with high accuracy.…”

Section: Problem Setupmentioning

confidence: 65%

“…Such a an approach can be quite useful in the assessment of combustion conditions inside combustors of energy and propulsion systems fed with hydrogen and when estimating hazardous risks related to hydrogen leakage and subsequent explosion. Note that the current results are applicable only for confined volumes, while flame acceleration in free space develops according to distinct mechanisms and, therefore, should be considered separately [ 27 ].…”

Section: Discussionmentioning

confidence: 99%

“…The characteristic decomposition method underlying the CABARET technique allows for a straightforward description of the inflow and outflow boundary conditions via the relationships between characteristics. Recently, this numerical technique was adopted by several authors for the numerical analysis of combustible systems, and they showed its usefulness in solving the problems of reactive gas dynamics [ 25 , 26 , 27 ]. In particular, the chosen numerical technique is thoroughly validated for hydrogen–air flames in [ 25 ].…”

Section: Problem Setupmentioning

confidence: 99%

See 2 more Smart Citations

On the Critical Condition for Flame Acceleration in Hydrogen-Based Mixtures

2023

Self Cite

View full text Add to dashboard Cite

The paper presents a novel numerical approach to the quantitative estimation of the concentration limits for flame acceleration in hydrogen-based mixtures. A series of calculations are carried out for hydrogen–air and hydrogen–oxygen flames in channels. The analysis of the obtained numerical results provided the value of 11 ± 0.25 % hydrogen content in the mixture as a lean concentration limit of flame acceleration that agrees well with the available experimental data. Moreover, the basic physical mechanism responsible for the transition from the steady mode of flame propagation to the accelerated one is distinguished. The mechanism is related to flame stretching in the region of interaction with the boundary layer and the competition between the joint increase in burning rate and heat losses. The novel technique for the estimation of concentration limits of flame acceleration presented here can be applied to assess combustion conditions inside combustors of energy and propulsion systems fed with hydrogen. The results are also useful in estimating explosion and fire risks in hydrogen storage, transport, and utilization facilities as parts of hydrogen energy and propulsion systems.

show abstract

Section: Problem Setupmentioning

confidence: 65%

Section: Discussionmentioning

confidence: 99%

Section: Problem Setupmentioning

confidence: 99%

See 1 more Smart Citation

On the Critical Condition for Flame Acceleration in Hydrogen-Based Mixtures

2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the context of unconfined ideal gas chemical flames the latter issue has recently been addressed in Ref. [11] reproducing both the Darrieus-Landau (DL) wrinkling and, most importantly, DDT.…”

Section: Discussionmentioning

confidence: 99%

“…There is a general consensus that stellar explosions are manifestations of the deflagration-to-detonation transition of an outward propagating self-accelerating thermonuclear flame subjected to instability/ turbulence-induced corrugations. A similar problem arises in unconfined terrestrial flames where a positive feedback mechanism leading to the pressure runaway has been identified [2][3][4][5][6][7][8][9][10][11][12]. As has been recently shown [13], there is no substantial difference between terrestrial and stellar DDT events as far as physical mechanisms are concerned.…”

Section: Introductionmentioning

confidence: 98%

Modeling of thermonuclear fusion flames : transition to detonation

Gordon,

Kagan,

Sivashinsky

2021

Preprint

View full text Add to dashboard Cite

The paper is concerned with identification of the key mechanisms controlling deflagration-todetonation transition in stellar medium. The issue of thermal runaway triggered by positive feedback between the advancing flame and the flame-driven precompression is discussed in the framework of a one-dimensional flame-folding model. The paper is an extension of the authors' previous study dealing with the non-stoichiometric fusion, f uel → products, kinetics (Phys.Rev.E, 103( 2021)) over physically more relevant, f uel + f uel → products, kinetics. Despite this change the runaway effect endures. The transition occurs prior to merging of the flame with the flame-supported precursor shock, i.e. the pretransition flame does not reach the threshold of Chapman-Jouguet deflagration.

show abstract

Flame Acceleration and Deflagration-To-Detonation Transition

Liberman¹

2021

Combustion Physics

View full text Add to dashboard Cite

Mechanism of transition to detonation in unconfined volumes

Cited by 18 publications

References 46 publications

On the Critical Condition for Flame Acceleration in Hydrogen-Based Mixtures

On the Critical Condition for Flame Acceleration in Hydrogen-Based Mixtures

Modeling of thermonuclear fusion flames : transition to detonation

Flame Acceleration and Deflagration-To-Detonation Transition

Contact Info

Product

Resources

About