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- W2167610010 abstract "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 into different 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." @default.
- W2167610010 created "2016-06-24" @default.
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- W2167610010 date "2014-01-01" @default.
- W2167610010 modified "2023-09-25" @default.
- W2167610010 title "Numerical Simulation of the Deflagration-to-Detonation Transition in Inhomogeneous Mixtures" @default.
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- W2167610010 doi "https://doi.org/10.1155/2014/686347" @default.
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