Flamelet surface density modelling of turbulent deflagrating flames in vented explosions |
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| Affiliation: | 1. Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough LE11 3TU, UK;2. Department of Mechanical Engineering, Cairo University, Cairo, Egypt;1. Lawrence Livermore National Laboratory, Livermore, CA 94550, United States;2. Colorado School of Mines, Golden, CO 80401, United States;3. University of California, Davis, CA 95616, United States;4. Los Alamos National Laboratory, Los Alamos, NM 87545, United States;5. Abilene Christian University, Abilene, TX 79699, United States;6. California Polytechnic State University, San Luis Obispo, CA 93407, United States;7. Oregon State University, Corvallis, OR 97331, United States;1. Warsaw University of Technology, Institute of Heat Engineering, Nowowiejska 21/25 00-665 Warsaw, Poland;2. Scientific and Research Centre for Fire Protection National Research Institute, Aleja Nadwiślańska 213, 05-420 Józefów, Poland |
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| Abstract: | The performance of two reaction rate models based on the laminar flamelet concept have been examined by calculating the behaviour of turbulent flame deflagration inside a semi-confined explosion tube. The models formulate the mean rate of reaction as a function of a transport equation for the flamelet surface density. The difference in the models is in modelling the source/sink terms of the flamelet surface density transport equation. The models are validated using laser diagnostics of flame deflagration in methane–air flammable mixture. The predictions are compared with experimental results for propagation, pressure history and flame speed. Sensitivity to cross-flow effects are investigated through comparison between two- and three-dimensional calculations. The numerically simulated results show that experimental trends are well reproduced by both models. |
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