CHARACTERIZATION OF HIGH-PRESSURE HYDROGEN LEAKAGES

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外文摘要：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 inform 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.

外文关键词：

Hydrogen leaksUnder-Expanded Jets in Cross-flowGas TurbineVentilationSafety

作者：

Davide Cerbarano、Ermanno Lo Schiavo、Lorenzo Tieghi、Giovanni Delibra、Stefano Minotti、Alessandro Corsini

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作者单位：

Sapienza University of Rome, Italy

Baker Hughes - Florence, Italy

会议名称：

ASME Turbo Expo: Turbomachinery Technical Conference and Exposition

会议地点：

Boston(US)

会议母体文献：

Proceedings of the ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition

页码：

218-228

出版时间：

2023