Details
Title | Influence of Chemical Kinetics on Detonation Initiation by Temperature Gradients in H₂/air and CH₄/air Explosions // Proceedings of the Ninth International Seminar on Fire and Explosion Hazards: 21-26 April 2019, Saint Petersburg, Russia. Vol. 2 |
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Creators | Wang С. ; Qian С. ; Liu J. ; Liberman M. |
Organization | Beijing Institute of Technology ; Stockholm University |
Imprint | Saint Petersburg, 2019 |
Collection | Общая коллекция |
Document type | Article, report |
File type | |
Language | English |
DOI | 10.18720/SPBPU/2/k19-5 |
Rights | Свободный доступ из сети Интернет (чтение, печать, копирование) |
Record key | RU\SPSTU\edoc\61220 |
Record create date | 6/20/2019 |
Understanding the mechanisms of explosions is essential for the development of safety measured and for minimizing devastating hazards. Due to the complexity of real chemistry, a one-step reaction model has been often used for theoretical and numerical studies. In this paper we compare conditions for the detonation development from the spontaneous wave in a hot spot for a one-step model with that obtained for detailed chemical models. It is shown that for detailed chemical models conditions required for the detonation development from the spontaneous wave in a hot spot are more limited than that for the use of simplified chemical models. In particular, the minimum hot spot size capable of producing a detonation calculated with the detailed chemical model is at least an order of magnitude larger than that predicted by a one-step model even at high initial pressures. The impact of a detailed chemical model is particularly pronounced for the methane/air mixture, where not only is the hot spot size much greater than that predicted by a one-step model, but the initiation of detonation by the hot spot with a temperature gradient is possible only if the ambient temperature outside the gradient is above 1100 K.
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