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Numerical Investigation on the Shock Wave Propagation, Hydrogen/air Mixing and Spontaneous Ignition Induced by High-pressure Hydrogen Release Inside the Tubes with Different Shaped Cross-sections by Liang Gong; Kaiyan Jin; Tianyu Mo; Xianwen Zheng; Yongzheng Yao; Yuchun Zhang is a Engineering article available to read on EtoBox.

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Hydrogen is regard as one of the most promising primary energy vectors solving the problems of air pollution and energy shortage. However, the spontaneous ignition is a major hazard during the application of high-pressure hydrogen. In this paper, a numerical investigation is conducted to study the shock wave propagation, hydrogen/air mixing and spontaneous ignition induced by high-pressure hydrogen release into the tubes with square, pentagon and circular cross-sections (tube wall angles are 90, 108 and 180° respectively). Large Eddy Simulation, Eddy Dissipation Concept coupling with the detailed hydrogen/air reaction mechanism and 10-step like opening process of burst disk are employed. The numerical results of ignition conditions and positions agree well against the previous experimental results. In the square and pentagon tubes, the inward-reflected and outward-reflected shock wave could be generated simultaneously and interact with each other due to the radial propagation of leading shock wave. In the circular tube, however, the two types of reflected shock generate alternately and the interaction disappears. The higher viscous resistance at wall corner induces the formation of

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Author

Liang Gong; Kaiyan Jin; Tianyu Mo; Xianwen Zheng; Yongzheng Yao; Yuchun Zhang

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)