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A closer look at BLEVE overpressure
Institution:1. von Karman Institute, Environmental and Applied Fluid Dynamics Department, 72, Chaussée de Waterloo, B1640 Rhode-St-Genèse, Belgium;2. Department of Mechanical and Materials Engineering, Queen''s University, Kingston, Ontario, Canada;3. Ecole des Mines d’Alès, Laboratoire Génie de l’Environnement Industriel, Alès, France;4. CEA, DAM, GRAMAT, F-46500 Gramat, France;1. Center for Process Design, Safety and Loss Prevention (CPSL), Chemical and Petroleum Engineering Department, Sharif University of Technology, Tehran, Iran;2. Centre for Technological Risk Studies (CERTEC), Barcelona East School of Engineering (EEBE), Universitat Politècnica de Catalunya, BarcelonaTech (UPC), Eduard Maristany 10-14, 08019, Barcelona, Catalonia, Spain;1. State Key Laboratory of Explosion Science & Technology, Beijing Institute of Technology, Beijing 100081, China;2. Systems Engineering Research Institute, Beijing 100094, China;3. Production Technology Research Institute of Jilin Oilfield of PetroChina, Songyuan 138000, China
Abstract:The overpressure produced by the boiling liquid expanding vapor explosion (BLEVE) is still not well understood. Various methods have been published on the overpressure modeling in the far field. They mostly differ by the modeling of the expansion energy, used to scale the distance to the source where the overpressure needs to be calculated. But these methods usually include a experimentally fitted reduction factor, and are mostly overestimating the overpressures. Today there is a growing interest in modeling the BLEVE overpressure in the near field, for studying the blast effect on critical infrastructure such as bridges and buildings. This requires a much better understanding of the BLEVE blast. This paper goes deeper in the understanding of the physical phenomenon leading to the BLEVE blast wave generation and propagation. First, mid-scale BLEVE experiments in addition to new experimental data for near field blast from a small scale supercritical BLEVE are analyzed. And second, an analysis method of the shocks observed in the experiments is presented based on fundamental gas dynamics, and allows the elaboration of a new modeling approach for BLEVE overpressure, based on the calculation of the initial overpressure and radius of the blast.
Keywords:BLEVE  Blast wave  Overpressure  Modeling  Moving shock  Stationary shock
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