CFD based simulation of hydrogen release through elliptical orifices |
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| Affiliation: | 1. Institute of Engineering Innovation, The University of Tokyo, 2-11-16 Yayoi, Bunkyo, Tokyo 113-8656, Japan;2. Dept. of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan;1. Centre for Fire and Explosion Studies, School of Mechanical and Automotive Engineering, Kingston University London, Friars Avenue, London SW15 3DW, United Kingdom;2. School of Energy and Power Engineering, Dalian University of Technology, Dalian, China;3. School of Engineering, University of Warwick, Coventry CV4 7AL, United Kingdom;1. Pro-Science GmbH, Ettlingen, Parkstr. 9, 76275, Germany;2. Karlsruhe Institute of Technology, IKET, Germany;1. LIG Nex1 Co., Ltd., PGM R&D Lab., Gyeonggi, Republic of Korea;2. Department of Mechanical and Aerospace Engineering, Institute of Advanced Aerospace Technology, Seoul National University, Seoul 151-744, Republic of Korea |
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| Abstract: | Computational Fluid Dynamics (CFD) is employed to investigate the hydrogen jet exiting through different shapes of orifices. The effect of orifice geometry on the structure, development and dispersion of a highly under-expanded hydrogen jet close to the exit is numerically investigated. Various shapes of orifices are evaluated, including holes with constant areas such as elliptical and circular openings, as well as, enlarging circular orifices. A three-dimensional in-house parallel code is exploited to simulate the flow using an unstructured tetrahedral finite volume Euler solver. The numerical simulations indicate that, for a high pressure reservoir hydrogen release, the area of the orifice is the main geometric parameter influencing the centerline pressure at the hydrogen-air interface and the transient peak temperature, while the elliptical or expanding orifices slightly mitigate the auto-ignition risks associated with the accidental release of hydrogen. Therefore, circular openings represent the most conservative geometry for the study of auto-ignition of hydrogen. |
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| Keywords: | Hydrogen Computational fluid dynamics Under-expanded jet Elliptical orifice Enlarging orifice |
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