Experimental research on influence of geometrical configuration on high pressure hydrogen outflow ignition process

• Autorzy: Oleszczak P. , Mężyk Ł. , Wolański P.
• Języki publikacji: EN

Abstrakty

EN

Hydrogen is regarded as a potential future fuel for various kinds of vehicles: fuel cell cars, trucks, buses etc. Storing and transportation issues are the crucial safety problems concerned with utilization ofhydrogen. Because of its very łów density hydrogen needs to be stored under very high pressure, in range of 35 division sign 70 MPa, and this create hazard of sudden discharge of hydrogen leading to ignition and severe accident. The aim of the presented research is an experimental investigation of hydrogen ignition as a result of a compression and heating of air by shock wave generated by the discharge of the hydrogen. Mixing of the air heated up by the shock wave and expanding hydrogen can produce combustible mixture of sufficiently high temperature and can lead to ignition. The critical conditions for ignition depend mainly on hydrogen discharge pressure, geometrical configuration, parameters of the ambient air, obstacles, etc. Experimental research -was conducted on a facility specially constructed in Combustion Laboratory, the Institute of Heat Engineering, Warsaw University of Technology. The facility consists from the pressure tank and high pressure hydrogen installation. To allow visualization the observation section is equipped with high quality optical windows. Schlieren visualization system and high speed digital camera was used to register high pressure hydrogen outflow and potential ignition. The high speed digital camera was used to take Schlieren or direct pictures of the process. Additionally, the experiment is registered with use of conventional digital camera. Experiments were conducted for different discharge pressure of hydrogen and outflow to "open space " as well to specially prepared obstacles. Critical condition for which ignition occurs were evaluated for both cases. The high speed Schlieren and direct pictures taken during the experiments are presented in the paper. The influence of presence of obstacles on the feasibility of hydrogen ignition during outflow from high pressure installation is discussed and analyzed.

Słowa kluczowe

EN

propulsion; safety; hydrogen; ignition; visual registration

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2009
• Tom: Vol. 16, No. 4
• Strony: 357--366
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Oleszczak P.

autor

Mężyk Ł.

autor

Wolański P.

• Warsaw University of Technology, Faculty of Power and Aeronautical Engineering Institute of Heat Engineering Nowowiejska 21/25, 00-665 Warsaw, Poland Tel. [phone],

Bibliografia

• [1] Wolanski, P., Mechanism of Synthesis Gas Explosion During Outflow from High Pressure Installation, Chemik, Rok XXV, Nr 1. pp. 23-27, 1972.
• [2] Wolanski, P., Wojcicki, S., Investigation into the Mechanism of Diffusion Ignition of a Combustible Gas Flowing into Oxidizing Atmosphere, Fourteenth Symposium (International) on Combustion, , pp 1217-1223, Pittsburgh, 1973.
• [3] Wolanski, P., Dynamics of Gas Mixtures Ignition, Wydawnictwo Politechniki Warszawskiej, Warszawa 1978.
• [4] Golub, V. V., Diffusion Self Ignition of Sudden Discharge of Hydrogen, 2008.
• [5] Bond, J., Sources of Ignition: Flammability Caharacteristics of Chemicals and Products, Butterworths-Heinemann Ltd., p. 52, Oxford, 1991.
• [6] Prudent Practices in the Laboratory: Handling and Disposal of Chemicals, National Research Council, National Academy Press, p. 123, Washington, DC, 1995.
• [7] Edeskuty, F. J., Stewart W. F., Safety in the Handling of Cryogenic Fuels, Plenum Publishing Corporation, Chapter 7, New York, 1996.
• [8] Liu, Y.-F., Tsaboi, N., Sato, H., Higashino, F., Hayashi, A. K., Direct Numerical Simulation on Hydrogen Fuel Jetting From High Pressure Tank, Proceedings of The 20th International Colloquium on the Dynamics of Explosions and Reacting Systems, Montreal, Canada, 2005.
• [9] Liu, Y. F., Tsaboi, N., Sato, H., Higashino, F., Hayashi, A. K., Numerical analysis of auto-ignition in high pressure hydrogen jetting into air, Proceedings of The 31th International Symposium on Combustion, Heidelberg, Germany, 2006.
• [10] Dembele, S., Zhang, J., Wen, J. X., Exploratory study of under-expanded sonic hydrogen jets and jet flames, 5th International Seminar on Fire and Explosion Hazards, Edinburgh, UK, 2007.