Objectif TO CLARIFY BY EXPERIMENT THE RELATIONSHIP BETWEEN INTEGRAL LENGTH SCALE L (MEAN EDDY SIZE) AND VT Vapour cloud explosions have proved to be potentially devastating. Incidents as in Flixborough and Beek have shown the need to assess the risk of vapour cloud explosions. Gas explosion research during the last decade shows that a fuel-air mixture is explosive only under appropriate boundary conditions, ie only where the mixture is partially confined and/or obstructed.In general the initial stage in the process of deflagrative combustion in gas explosions is more or less laminar, which is a slow process. However, slow laminar combustion can develop into an intense explosive and blast generating process, caused by the phenomenon of turbulence. The turbulence is caused by the influence of obstacles and/or confinements.The effect of artificially produced turbulence on flame propagation has been investigated and an experimental parameter study into flame propagation in diverging and nondiverging flows obstructed by obstacles and partial confinement has been performed.THE INFLUENCE OF TURBULENT LENGTH SCALE L (MEAN EDDY DIAMETER) ON TURBULENT FLAME PROPAGATION SHALL BE INVESTIGATED BY TESTING GAS/-AIR-MIXTURES OF WELL DEFINED TURBULENCE; LENGHT SCALE L THEN HAS TO BE VARIED SYSTEMATICALLY BY THE DIAMETER D OF THE EXPLOSIVE VOLUME; SPECIAL EMPHASIS LIES ON LARGER TURBULENT FIELDS CORRESPONDING TO PRACTICAL SITUATIONS (D OF THE ORDER OF SOME METER) RESULTS WILL GIVE DIRECT RELATIONS BETWEEN LENGTH SCALE L AND TURBULENT FLAME VELOCITY VT. FROM THIS SUPPORT IS EXPECTED FOR THE INTERPRETATION AND COMPARISON OF OTHER TESTS OR PRACTICAL SITUATIONS WHERE TURBULENCE IS GENERATED BY CONFINEMENT AND/OR REPEATED OBSTACLES. HENCE, THE RESULTS OF THIS STUDY WILL SERVE AS FUNDAMENTAL DATA FOR INTERPRETING THE RESULTS FROM THE EXPERIMENTAL INVESTIGATIONS ON THE INFLUENCE OF REPEATED OBSTACLES INTENDENT BY TNO (SEE NO. 3). A CONTINUOUS EXCHANGE OF RESULTS AND DATA IS THEREFORE INTENDED BETWEEN TNO AND PTB DURING THEIR STUDIES. IN COMBINATION WITH THESE MORE PRACTICAL EXPERIENCES RESULTS MIGHT SERVE TO ESTABLISHED SOUND SCALING RULES FOR RELATING FUNDAMENTALLY TURBULENCE DATA TO FLAME VELOCITY IN AN EXPLOSION. Programme(s) FP1-TECHHAZ C - Multiannual R&D programmes (EEC) in the field of the environment - Pilot projects on major technological hazards -, 1986-1990 Thème(s) Data not available Appel à propositions Data not available Régime de financement CSC - Cost-sharing contracts Coordinateur PHYSIKALISCH-TECHNISCHE BUNDESANSTALT Contribution de l’UE Aucune donnée Adresse Bundesallee 100 BRAUNSCHWEIG Allemagne Voir sur la carte Liens Site web Opens in new window Coût total Aucune donnée
