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Quantitative Bestimmung der Strahlungsleistung von instationären H2-Luft Explosionen

Quantitative measurement of radiant flux of instationary H2-air explosions
: Blanc, A.; Eckl, W.; Herrmann, M.

Fraunhofer-Institut für Chemische Technologie -ICT-, Pfinztal:
Energetic Materials - Analysis, Characterization and Test Techniques
Pfinztal: ICT, 1994 (Proceedings of the International Annual Conference of ICT 25)
Fraunhofer-Institut für Chemische Technologie (Internationale Jahrestagung) <25, 1994, Karlsruhe>
Fraunhofer ICT ()
gas temperature; hydrogen-air mixture; hydrogen storage; infrared; particle temperature; radiant flux; simulation; tank explosion; ultraviolet; visible

Investigating safety aspects of hydrogen storage, tank explosions were simulated. Online measurements of the emitted radiation in the spectral range from 200 to 14000 nm were realized applying a grating spectrometer (time resolution: 100 spectra/second) in the ultraviolet and visible spectral range and a filter-wheel based system (time resolution: 100 spectra/second) in the infrared. The measured data allowed to calculate the behavior of emission, temperature of the gas phase and temperature of involved particles. Gas temperatures of 2000-2700K were determined analyzing IR-water bands. Particle temperatures were estimated to 1200-1400K assuming black body radiation. The time dependence of the emitted radiation showed that the occurring flame must be considered as optically thick. Remarkable are the short duration of the event (2-4 seconds) and the incomplete reaction of hydrogen with air observed in some experiments. The vessel pressure and the amount of hydrogen exhibit only low influ ence on the experiment.