This paper investigates the formation of combustible clouds from pulsed release of hydrogen in a garage. The analysis consists of two steps: (1) 3d calculation of the time and space dependent H2-concentration field, and (2) evaluation of the resulting combustion hazard, using newly developed criteria for flame acceleration and detonation potential. In case of a low release rate (0.34 g/s over 100 s) the possibility for a slow or fast deflagration exists essentially only during the release period and involves only few g H2. Detonations are excluded. The mixing processes have sufficient time for H2 dilution. In case of the fast release rate (3.4 g/s over 10 s) the balance between H2-source and mixing processes is dominated by the source leading to large inhomogeneities, a long term potential for slow deflagration, a short term (20 s) potential for fast turbulent deflagration and detonation. For control of such situations effective mitigation measures appear necessary and feasible.
Numerical simulation of hydrogen release in a private garage
Numerische Simulation der Wasserstofffreisetzung in einer privaten Garage
2001
10 Seiten, 4 Bilder, 2 Tabellen, 7 Quellen
Aufsatz (Konferenz)
Englisch
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