Community Research and Development Information Service - CORDIS


In gas cloud explosions, turbulence is produced by the flow field induced by the combustion process. But turbulence can also be produced by an initial flow field, due to atmospheric wind or technical devices. This turbulence may lead to an increased rate of chemical reaction, inducing high pressure levels. The reported laboratory scale experiments were designed to investigate the influence of a flow field, present at the moment of ignition inside a partially confined hydrocarbon - air cloud. These experiments used a flow channel capable of producing an unsteady flow field of combustible gas independently of the combustion process itself. The parameters which varied in these tests are: initial flow velocity, gas mixture composition and geometry. The tests were carried out with stoichiometric ethylene - air and propane - air mixtures. The measured quantities are: pressure time history inside the test section, CH radical radiation. High-speed photographs were also taken. The results show that initial flow speed and reactivity of the mixture have a strong influence on the maximum overpressure and duration of the positive pressure phase, but quenching effects may become important for high flow velocities and mixtures of low reactivity.

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Bibliographic Reference: EUR 9593 EN (1984) FS, 119 P. BFR 400, EUROFFICE, LUXEMBOURG, POB 1003
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