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Numerical study on the spontaneous ignition of pressurized hydrogen release through a tube into air

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Xu, B. P., El Hima, L., Wen, Jennifer X., Dembele, S., Tam, V. H. Y. and Donchev, T. (2008) Numerical study on the spontaneous ignition of pressurized hydrogen release through a tube into air. Journal of Loss Prevention in the Process Industries, Volume 21 (Number 2). pp. 205-213. doi:10.1016/j.jlp.2007.06.015

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Official URL: http://dx.doi.org/10.1016/j.jlp.2007.06.015

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Abstract

Spontaneous ignition of pressurized hydrogen release through a tube into air is investigated using a modified version of the KIVA-3V CFD code. A mixture-averaged multi-component approach is used for accurate calculation of molecular transport. Autoignition and combustion chemistry is accounted for using a 21 step kinetic scheme. Ultra fine meshes are employed along with the Arbitrary Lagrangia–Eulerian (ALE) method to reduce false numerical diffusion. The study has demonstrated a possible mechanism for spontaneous ignition through molecular diffusion.

In the simulated scenario, the tube provided additional time to achieve a combustible mixture at the hydrogen–air contact surface. When the tube was sufficiently long under certain release pressure, autoignition would initiate inside the tube at the contact surface due to mass and energy exchange between low temperature hydrogen and shock-heated air through molecular diffusion. Following further development of the hydrogen jet downstream, the contact surface became distorted. Turbulence plays an important role for hydrogen/air mixing in the immediate vicinity of this distorted contact surface and led the initial laminar flame to transit into a stable turbulent flame.

Item Type: Journal Article
Divisions: Faculty of Science > Engineering
Journal or Publication Title: Journal of Loss Prevention in the Process Industries
Publisher: Elsevier Ltd
ISSN: 0950-4230
Official Date: 2008
Dates:
DateEvent
2008Published
Volume: Volume 21
Number: Number 2
Page Range: pp. 205-213
DOI: 10.1016/j.jlp.2007.06.015
Status: Peer Reviewed
Publication Status: Published

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