The effect of tube internal geometry on the propensity to spontaneous ignition in pressurized hydrogen release

Spontaneous ignition of compressed hydrogen release through a length of tube with different internal geometries is numerically investigated using our previously developed model. Four types of internal geometries are considered: local contraction, local enlargement, abrupt contraction and abrupt enla...

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Bibliographic Details
Published in:International journal of hydrogen energy 2014-12, Vol.39 (35), p.20503-20508
Main Authors: XU, B. P, WEN, J. X
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
Applied sciences
Energy
Enlargement
Exact sciences and technology
Flammable
Fuels
Heating
Hydrogen
Ignition
Mathematical models
Planes
Spontaneous
Tubes
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Summary:Spontaneous ignition of compressed hydrogen release through a length of tube with different internal geometries is numerically investigated using our previously developed model. Four types of internal geometries are considered: local contraction, local enlargement, abrupt contraction and abrupt enlargement. The presence of internal geometries was found to significantly increase the propensity to spontaneous ignition. Shock reflections from the surfaces of the internal geometries and the subsequent shock interactions further increase the temperature of the combustible mixture at the contact region. The presence of the internal geometry stimulates turbulence enhanced mixing between the shock-heated air and the escaping hydrogen, resulting in the formation of more flammable mixture. It was also found that forward-facing vertical planes are more likely to cause spontaneous ignition by producing the highest heating to the flammable mixture than backward-facing vertical planes.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2014.04.141