The role of turbulence in the validity of the cubic relationship |
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| Institution: | 1. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, Piazzale Tecchio 80, 80125, Napoli, Italy;2. Istituto di Ricerche sulla Combustione - Consiglio Nazionale delle Ricerche, Piazzale Tecchio 80, 80125, Napoli, Italy;1. Cavanilles Institute of Biodiversity and Evolutionary Biology, University of Valencia, Catedrático José Beltrán, 2, Paterna, E-46980, Spain;2. Department of Biology and Geology, IES Violant de Casalduch, Avinguda Castelló s/n, Benicàssim, E-12560, Spain;1. Institute of Cell Biology, Histology and Embryology, Medical University Graz, Graz, Austria;3. Institute of Pathology, Medical University Graz, Graz, Austria;2. Department of Obstetrics and Gynaecology, Medical University Graz, Graz, Austria;4. Experimental and Clinical Research Center, a Joint Cooperation between the Charité Medical Faculty and the Max-Delbrueck Center for Molecular Medicine, Berlin, Germany;1. Semenov Institute of Chemical Physics, RAS, Kosygin str. 4, Moscow 119991 Russia;2. National Research Nuclear University MEPhI, Kashirskoye shosse 31, Moscow 115409, Russia;3. CNES, Toulouse 31401, France |
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| Abstract: | The effect of turbulence on unsteady premixed flame propagation and associated pressure rise during explosion of stoichiometric CH4/air in closed spherical vessels of different size was investigated by means of CFD simulation. Computations were run by varying the vessel volume from 20 l to 200 l and to 1 m3.Numerical results have shown that, at fixed initial conditions, the turbulence kinetic energy induced by the propagating flame increases with increasing vessel volume. It has been demonstrated that the cubic relationship does not apply. Under the conditions investigated, a correction to the cubic relationship has been proposed to take into account the effect of the vessel volume on turbulence. |
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| Keywords: | CFD Explosion Turbulence Deflagration index Cubic relationship |
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