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Numerical Simulation of the Deflagration-to-Detonation Transition in Inhomogeneous Mixtures
Joint Authors
Sattelmayer, Thomas
Ettner, Florian
Vollmer, Klaus G.
Source
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-05-19
Country of Publication
Egypt
No. of Pages
14
Main Subjects
Abstract EN
In this study the hazardous potential of flammable hydrogen-air mixtures with vertical concentration gradients is investigated numerically.
The computational model is based on the formulation of a reaction progress variable and accounts for both deflagrative flame propagation and autoignition.
The model is able to simulate the deflagration-to-detonation transition (DDT) without resolving all microscopic details of the flow.
It works on relatively coarse grids and shows good agreement with experiments.
It is found that a mixture with a vertical concentration gradient can have a much higher tendency to undergo DDT than a homogeneous mixture of the same hydrogen content.
In addition, the pressure loads occurring can be much higher.
However, the opposite effect can also be observed, with the decisive factor being the geometric boundary conditions.
The model gives insight intodifferent modes of DDT.
Detonations occurring soon after ignition do not necessarily cause the highest pressure loads.
In mixtures with concentration gradient, the highest loads can occur in regions of very low hydrogen content.
These new findings should be considered in future safety studies.
American Psychological Association (APA)
Ettner, Florian& Vollmer, Klaus G.& Sattelmayer, Thomas. 2014. Numerical Simulation of the Deflagration-to-Detonation Transition in Inhomogeneous Mixtures. Journal of Combustion،Vol. 2014, no. 2014, pp.1-14.
https://search.emarefa.net/detail/BIM-1039870
Modern Language Association (MLA)
Ettner, Florian…[et al.]. Numerical Simulation of the Deflagration-to-Detonation Transition in Inhomogeneous Mixtures. Journal of Combustion No. 2014 (2014), pp.1-14.
https://search.emarefa.net/detail/BIM-1039870
American Medical Association (AMA)
Ettner, Florian& Vollmer, Klaus G.& Sattelmayer, Thomas. Numerical Simulation of the Deflagration-to-Detonation Transition in Inhomogeneous Mixtures. Journal of Combustion. 2014. Vol. 2014, no. 2014, pp.1-14.
https://search.emarefa.net/detail/BIM-1039870
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1039870