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http://dx.doi.org/10.7837/kosomes.2022.28.2.385

Numerical Study on the Effect of Area Changes in Air Inlets and Vent Ports on the Ventilation of Leaking Hydrogen  

Lee, Chang-Yong (Division of Marine Engineering, Incheon National Maritime High School)
Cho, Dae-Hwan (Division of Marine Engineering, Mokpo National Maritime University)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.28, no.2, 2022 , pp. 385-393 More about this Journal
Abstract
Hydrogen has reduced greenhouse gas (GHG) emissions, the main cause of global warming, and is emerging as an eco-friendly energy source for ships. Hydrogen is a substance with a lower flammability limit (LFL) of 4 to 75% and a high risk of explosion. To be used for ships, it must be sufficiently safe against leaks. In this study, we analyzed the effect of changes in the area of the air inlet / vent port on the ventilation performance when hydrogen leaks occur in the hydrogen tank storage room. The area of the air inlet / vent port is 1A = 740 mm × 740 mm, and the size and position can be easily changed on the surface of the storage chamber. Using ANSYS CFX ver 18.1, which is a CFD commercial software, the area of the air inlet / vent port was changed to 1A, 2A, 3A, and 5A, and the hydrogen mole fraction in the storage chamber when the area changed was analyzed. Consequently, the increase in the area of the air inlet port further reduced the concentration of the leaked hydrogen as compared with that of the vent port, and improved the ventilation performance of at least 2A or more from the single air inlet port. As the area of the air inlet port increased, hydrogen was uniformly stratified at the upper part of the storage chamber, but was out of the LFL range. However, simply increasing the area of the vent port inadequately affected the ventilation performance.
Keywords
Hydrogen leakage; Computational Fluid Dynamic; Stratification; Ventilation; Lower flammability limit; Hydrogen mole fraction;
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Times Cited By KSCI : 1  (Citation Analysis)
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