Un-ignited and ignited high pressure hydrogen releases : concentration - turbulence mapping and overpressure effects

Abstract : Safety studies on hydrogen production industrial installations revealed the importance of accurate prediction of the overpressure effects generated by delayed explosions of turbulent hydrogen jets. Analysis of previous experimental works confirms auto-similarity correlations of concentration and velocity. It confirms also the high level of overpressure produced by the jet explosion. But, the link between turbulent structures of flammable jet and flame behavior are not well established. To deal with this particular problem, a joint industrial project was created between AIR LIQUIDE, AREVA STOCKAGE ENERGIE, and INERIS. The purposes of this experimental work are to realize un-ignited and ignited high pressure hydrogen free jets, to map hydrogen free jets in term of concentration and velocity, to measure turbulence directly in the flammable free jet, to characterize flame behavior regarding to the turbulent flow field and to compare these experimental results (dispersion and explosion) with blind FLACS modelling.