transport of dangerous goods and risk management - Kirilo Savić

TRANSPORT OF DANGEROUS GOODS AND RISK MANAGEMENT 120Having uncertainties due to the exact composition of the inflammable hydro-carbon-liquid that was used in theexperiments – the CFD approach was conducted using the heptane – a most common fuel for (physical) firescenariosimulation and fire-fighting tests and exercises. Obeying the exact data on surface of the fire-place, themass-flux of the heptane was set so (in the boundary-conditions) to produce firstly 1.5MW and then 3.5MW fires.These fires “burned” during the computational simulation as well as during the experiment for 120s as well.Generally, the fire-plume’s properties differ as one “goes along” the approximated flame trajectory set within threemajor regions 41 of a large-scale combustion: continuous flame region, intermittent flame region and the plumeregion – all the general zones of the large-scale fire that we can observe at the pictures, recorded both in visiblelight-range and in IR-spectrum, in the “Sentvid”-tunnel during the physical experiment.The letter thermographs we used as one of the validation basis for the computational approach, where one canobserve qualitative correnspodence of the experimentaly recorded and computationally estimated results. Due to thenatural draft, both experimental as well as computational investigation-approach demonstrated transport of gaseouscombustion products towards lower geodetical position of the tunnel-exit (Figures 7 and 8).Figure 7. The thermographic image in the 119th second of the 3.5MW-fire during the physical simulation in the“Sentvid”-tunnel. Recognizable is direction of the fire-plume “going” towards the “Sentvid”- south-exit