Numerical study of the spontaneous ignition mechanisms of pressurized hydrogen released inside pipes with different structures

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2024-11-13 DOI:10.1016/j.ijhydene.2024.11.117

Haowei Qiu , Rui Zhou , Xing Li , Jun Li , Hongyu Huang

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Abstract

Hydrogen is considered a key clean energy carrier to achieve the global goal of carbon neutrality. But spontaneous ignition can occur when pressurized hydrogen is released into pipes, and the presence of different pipe structures will significantly affect the ignition mechanism. In this work, the effects of varied pipe structures on the shock wave propagation and spontaneous ignition characteristics are investigated by numerical simulation with the DNS-like approach, EDC combustion model, and 21-step detailed hydrogen combustion mechanism. Results show that the simulation is in well agreement with the experimental data. Five dominant spontaneous ignition mechanisms are provided depending on different pipe structures. Among all types of pipe structures investigated, contraction structures can lead to a greater increase in shock wave pressure due to more severe shock wave reflection and convergence. While enlargement structures can contribute to more mixing of hydrogen and air, causing more sufficient combustion. This study provides a comprehensive understanding and clear safety guidance to inform the practical application of hydrogen energy.

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对不同结构管道内释放的加压氢气自燃机制的数值研究

氢气被认为是实现全球碳中和目标的关键清洁能源载体。但是，当加压氢气被释放到管道中时可能会发生自燃，而不同管道结构的存在会对点火机制产生重大影响。本研究采用类 DNS 方法、EDC 燃烧模型和 21 步详细氢气燃烧机理，通过数值模拟研究了不同管道结构对冲击波传播和自燃特性的影响。结果表明，模拟结果与实验数据十分吻合。根据不同的管道结构，提供了五种主要的自燃机制。在所有被研究的管道结构类型中，收缩结构会由于更严重的冲击波反射和汇聚而导致冲击波压力的更大增加。而扩大型结构则会促进氢气和空气的混合，从而引起更充分的燃烧。这项研究为氢能的实际应用提供了全面的认识和明确的安全指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.