Hydrogen safety: Pressure Peaking Phenomena-unignited releases

DATASET MIGRATED FROM FIGSHARE: <div>The aim of this study was to validate a model for predicting overpressure arising from accidental hydrogen releases in areas with limited ventilation. Experiments were performed in a large-scale setup that included a steel-reinforced container of volume 14.9 m3 and variable ventilation areas and mass flow rates. The pressure peaking phenomenon, characterized as transient overpressure with a characteristic peak in a vented enclosure, was observed during all the experiments. The model description presented the relationship between the ventilation area, mass flow rate, enclosure volume, and discharge coefficient. The experimental results were compared with two prediction models representing a perfect mix and the real mix. The perfect mix assumed that all the released hydrogen was well stirred inside the enclosure during the releases. The real mix prediction s used the hydrogen concentration and temperature data measured during experiments. The prediction results with both perfect mix and real mix showed possible hazards during unignited hydrogen releases.</div>

本研究旨在验证一款用于预测有限通风区域内氢气意外泄漏引发超压的模型。实验依托大型实验装置开展，该装置包含容积为14.9立方米的钢质加固容器，以及可调节的通风面积与质量流量参数。所有实验均观测到压力峰值现象：该现象的特征为通风封闭舱体内出现瞬态超压并伴随特征性峰值。本研究提出的模型阐述了通风面积、质量流量、舱体容积与流量系数之间的关联规律。将实验结果与两种分别基于完全混合与实际混合假设的预测模型进行了对比：完全混合假设认为，在氢气泄漏过程中，所有泄出的氢气均在封闭舱体内被充分搅拌均匀；实际混合模型则采用实验过程中实测的氢气浓度与温度数据开展预测。完全混合与实际混合两种模型的预测结果均表明，未被引燃的氢气泄漏场景存在潜在安全隐患。