The nature and large eddy simulation of coherent deflagrations in a vented enclosure-atmosphere system |
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| Institution: | 1. FireSERT Institute (Block 27), University of Ulster, Newtownabbey, Co. Antrim BT37 0QB, UK;2. Shell Research and Technology Centre, Thornton, P.O. Box 1, Chester CH1 3SH, UK;1. Hydrogen Safety Engineering and Research Centre (HySAFER), Ulster University, UK;2. Graduate School of Engineering, The University of Tokyo, Japan;3. Department of Chemistry and Chemical Engineering, Yamagata University, Japan;4. Department of Chemical System Engineering, The University of Tokyo, Japan;1. Department of Physics and Technology, University of Bergen, Allégaten 55, 5007 Bergen, Norway;2. GexCon AS, Research and Development, Fantoftveien 38, P.O. Box 6015, Postterminalen, 5892 Bergen, Norway;3. School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK;4. GL Noble Denton, Holywell Park, Ashby Road, Loughborough LE11 3GR, UK;1. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;2. Chemical Engineering College, Beijing Institute of Petrochemical Technology, Beijing 102617, China;1. School of Chemical Engineering, Anhui University of Science and Technology, Huainan, 232001, Anhui, China;2. College of Environment and Resources, Fuzhou University, Fuzhou, 350116, China;3. Anhui Electric Power Research Institute, Hefei. 230601, China;4. Department of Fire Protection Engineering, China People''s Police University, Langfang, 065000, Hebei, China;1. College of Environment and Resources, Fuzhou University, Fuzhou 350116, PR China;2. School of Civil Engineering, Hefei University of Technology, Hefei 230009, PR China;3. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230027, PR China |
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| Abstract: | The nature of coherent deflagration phenomena in a vented enclosure-atmosphere system is analysed. The study is based on experimental observations of SOLVEX programme in the empty 547-m3 vented enclosure and consequent analysis of the same test by large eddy simulations (LES). A comparison between simulated and experimental pressure transients and dynamics of flame front propagation inside and outside the enclosure gave an insight into the nature of the complex simultaneous interactions between flow, turbulence and combustion inside the enclosure and in the atmosphere. It is revealed through LES processing of experimental data that the substantial intensification of premixed combustion occurs only outside the empty SOLVEX enclosure and this leads to steep coherent pressure rise in both internal and external deflagrations. The external explosion does not affect burning rate inside the enclosure. There is only one ad hoc parameter in the LES model, which is used to account for unresolved subgrid scale increase of flame surface density outside the enclosure. The model allows reaching an excellent match between theory and experiment for coherent deflagrations in the empty SOLVEX facility. The mechanism of combustion intensification in the atmosphere is discussed and the quantitative estimation of the model ad hoc parameter is given. |
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