Experimental investigation of highly pressurized hydrogen release through a small hole

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The dispersion characteristics of hydrogen leaking through a small hole from a high-pressure source were investigated experimentally to develop guidelines for determining safety distances for hydrogen stations. Tests were carried out for leaking holes with diameters of 0.5, 0.7 and 1.0 mm and for release pressures of 100, 200, 300 and 400 bar. For these realistic hydrogen leaking conditions, the Froude numbers are so large that the buoyancy effect, manifested by the hydrogen jets bending upward, can be expected to be negligible. Flow visualization was performed using an Nd-YAG laser to confirm that the buoyancy effect was negligible. By letting a thin laser sheet penetrate the center line of a hydrogen jet conveying Al2O3 particles, the particles were illuminated and the hydrogen jet was visualized. The hydrogen concentration was measured by sampling hydrogen at five points along the jet centerline, based on the large Froude number. The measured data were always lower than the isentropic prediction.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2014
Language
English
Article Type
Article
Keywords

SCALE UNINTENDED RELEASES; JET DIFFUSION FLAMES; BUOYANCY; MOMENTUM; METHANE; FIELD

Citation

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.39, no.17, pp.9552 - 9561

ISSN
0360-3199
DOI
10.1016/j.ijhydene.2014.03.044
URI
http://hdl.handle.net/10203/192726
Appears in Collection
ME-Journal Papers(저널논문)
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