Experimental and numerical research of hydrogen-blended natural gas leakage and diffusion in utility tunnels

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2025-03-20 DOI:10.1016/j.tust.2025.106578

Xiwen Chang , Minghao Li , Hui Han , Pengfei Duan , Yingying Kong , Zikang Qin , Jianlu Zhu , Yuxing Li

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引用次数: 0

Abstract

The safety of hydrogen-blended natural gas (HBNG) in underground utility tunnels continues to receive attention. In this study, an experiment platform for the leakage near-field of the utility tunnel is designed based on the similarity theory. The reliability of CFD numerical simulation in the leakage near field is verified by experiments. For the leakage process of HBNG, the increase of hydrogen blending ratio (HBR) enhances the diffusion in the horizontal direction. The gas concentration in the measurement points tend to a maximum value with increasing leakage time during the leakage process in the ventilated condition. The study carried out CFD numerical simulations of HBNG leakage in the entire utility tunnel. It was found that some changes in leak location do not affect the stabilized concentration during ventilation. The alarm time is linearly related to the horizontal distance of the alarm from the leak source. Based on the numerical simulation results, a simple model of HBR, alarm location and alarm trigger time was obtained. The model can provide some references for the location and number of alarms in the utility tunnel.

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氢混合天然气（HBNG）在地下公用事业隧道中的安全性一直受到关注。本研究基于相似性理论设计了公用事业隧道泄漏近场实验平台。通过实验验证了泄漏近场 CFD 数值模拟的可靠性。对于 HBNG 的泄漏过程，氢气混合比 (HBR) 的增加会增强水平方向的扩散。在通风条件下的泄漏过程中，随着泄漏时间的增加，测量点的气体浓度趋于最大值。研究对整个公用事业隧道中的 HBNG 泄漏进行了 CFD 数值模拟。结果发现，在通风过程中，泄漏位置的一些变化不会影响稳定浓度。报警时间与报警器与泄漏源的水平距离成线性关系。根据数值模拟结果，得到了一个关于 HBR、报警位置和报警触发时间的简单模型。该模型可为公用设施隧道内的报警位置和数量提供一些参考。

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

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.