高压氢气泄漏的表征

IF 1.4 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Davide Cerbarano, Lorenzo Tieghi, Giovanni Delibra, Ermanno Lo Schiavo, Stefano Minotti, Alessandro Corsini
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引用次数: 0

摘要

摘要减少燃气轮机碳排放依赖于用纯氢或混合氢为发动机提供燃料的策略。需要解决的主要技术挑战是:1)发动机的调整,特别是燃烧室的调整;2)为保证安全运行需要解决的一系列问题。事实上,与天然气相比,氢气燃料意味着涡轮外壳泄漏时爆炸的风险更高,通风系统的设计也更谨慎。因此,需要更深入地了解氢气泄漏情况,以调整外壳的安全设计策略。为此,进行了一系列的数值研究,以了解不同的甲烷-氢混合物(从纯甲烷到纯氢)从燃料压力从1.5到4.5 MPa的管道泄漏时的行为。在0 ~ 5m/s的交叉流通风条件下,研究了不同燃料混合物以欠膨胀射流形式泄漏的情况。与纯甲烷相比,纯氢轴对称可燃云的穿透距离是纯甲烷的三倍,而在横流条件下,发现了更复杂的三维行为,这可能会引发手稿中讨论的与安全相关的问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Characterization of High-Pressure Hydrogen Leakages
Abstract Reduction of gas turbines carbon emissions relies on a strategy for fueling the engines with pure or blended hydrogen. The major technical challenges to solve are i) the adjustments to the engine and in particular the combustion chamber and ii) a series of issues to solve to guarantee safe operations. In fact, compared to natural gas, hydrogen fueling implies higher risks of explosion in case of leak in the turbine enclosure and a more careful design of the ventilation system. Thus, a deeper comprehension of hydrogen leak scenarios is needed to adjust the safe design strategy of the enclosure. To this aim, a series of numerical investigations was carried out to understand how different methane-hydrogen blends (from pure methane to pure hydrogen) behave when leaking from a pipeline with fuel pressure that span from 1.5 to 4.5 MPa. The different fuel blends leaks in form of under-expanded jets were studied under different cross-flow ventilation conditions, with ventilation velocity spanning from 0 m/s to 5m/s. When compared to pure methane, the outcome is a three times longer penetration distance for pure hydrogen axisymmetric flammable clouds, whereas in cross-flow conditions a more complex three-dimensional behavior was found, potentially opening a safety-related concerns discussed in the manuscript.
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来源期刊
CiteScore
3.80
自引率
20.00%
发文量
292
审稿时长
2.0 months
期刊介绍: The ASME Journal of Engineering for Gas Turbines and Power publishes archival-quality papers in the areas of gas and steam turbine technology, nuclear engineering, internal combustion engines, and fossil power generation. It covers a broad spectrum of practical topics of interest to industry. Subject areas covered include: thermodynamics; fluid mechanics; heat transfer; and modeling; propulsion and power generation components and systems; combustion, fuels, and emissions; nuclear reactor systems and components; thermal hydraulics; heat exchangers; nuclear fuel technology and waste management; I. C. engines for marine, rail, and power generation; steam and hydro power generation; advanced cycles for fossil energy generation; pollution control and environmental effects.
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