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Numerical study of spontaneous ignition in pressurized hydrogen release through a length of tube with local contraction

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Xu, B. P. and Wen, Jennifer X. (2012) Numerical study of spontaneous ignition in pressurized hydrogen release through a length of tube with local contraction. International Journal of Hydrogen Energy, Volume 37 (Number 22). pp. 17571-17579. doi:10.1016/j.ijhydene.2012.04.150

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Official URL: http://dx.doi.org/10.1016/j.ijhydene.2012.04.150

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Abstract

Numerical investigations have been conducted on the effect of the internal geometry of a local contraction on the spontaneous ignition of pressurized hydrogen release through a length of tube using a 5th-order WENO scheme. A mixture-averaged multi-component approach was used for accurate calculation of molecular transport. The auto-ignition and combustion chemistry were accounted for using a 21-step kinetic scheme. It is found that a local contraction can significantly facilitate the occurrence of spontaneous ignition by producing elevated flammable mixture and enhancing turbulent mixing from shock formation, reflection and interaction. The first ignition kernel is observed upstream the contraction. It then quickly propagates along the contact interface and transits to a partially premixed flame due to the enhanced turbulent mixing. The partially premixed flames are highly distorted and overlapped with each other. Flame thickening is observed, which is due to the merge of thin flames. The numerical predictions suggested that sustained flames could develop for release pressure as low as 25 bar. For the release pressure of 18 bar, spontaneous ignition was predicted but the flame was soon quenched. To some extent this finding is consistent with Dryer et al.'s experimental observation in that the minimum release pressure required to induce a spontaneous ignition for the release through a tube with internal geometries is only 20.4 bar.

Item Type: Journal Article
Divisions: Faculty of Science > Engineering
Journal or Publication Title: International Journal of Hydrogen Energy
Publisher: Elsevier BV
ISSN: 0360-3199
Official Date: 2012
Dates:
DateEvent
2012Published
Volume: Volume 37
Number: Number 22
Page Range: pp. 17571-17579
DOI: 10.1016/j.ijhydene.2012.04.150
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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