Fire Safety Science Digital Archive

Experimental investigation of the influence of diluents of various chemical natures (helium, nitrogen, carbon, dioxide, pentafluoroethane, inhibitor AKAM) on a length of a vertical jet flame of hydrogen in still atmosphere was carried out. Experiments were executed on burners of an internal diameter 0.8 and 10 mm at various velocities of discharge of compositions H2 + diluent. It was found that inhibitor AKAM and pentafluoroethane cause a sufficient increase of the length of the jet flame, but at the same time chemically inert agents change the flame length much more slowly. Empirical coefficients in the well-known semi-empirical formula for calculations of the flame length of the mixtures hydrogen-diluent at various velocities of discharge and a diluent concentration were re-evaluated. A two-zone structure of the jet flame of the composition hydrogen + inhibitor AKAM at concentrations of inhibitor AKAM from 3 to 10 % (vol.).