2022 Fiscal Year Final Research Report
Safety Improvement for High-Pressure Hydrogen Facilities Using Jet Impact on Porous Plates
Project/Area Number |
20H02396
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Review Section |
Basic Section 25020:Safety engineering-related
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Research Institution | Gifu University |
Principal Investigator |
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Co-Investigator(Kenkyū-buntansha) |
平原 裕行 埼玉大学, 理工学研究科, 教授 (20201733)
姜 東赫 埼玉大学, 理工学研究科, 准教授 (40610366)
宮坂 武志 岐阜大学, 工学部, 教授 (60303666)
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Project Period (FY) |
2020-04-01 – 2023-03-31
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Keywords | 高圧水素噴流 / 多孔板 / 噴流衝突 / 水素漏えい / シャドウグラフ / PIV / 速度分布 / 濃度分布 |
Outline of Final Research Achievements |
We considered that the velocity reduction of the jet (momentum deficit) is converted into drag force on the porous plate, and measured the drag force acting on the porous plate to investigate the effects of opening ratio and hole diameter on the velocity reduction of the jet. The momentum deficit was independent of hole diameter, and was larger for smaller opening ratio. These trends were consistent with expectations, but the momentum deficit was approximately 20% smaller at most than the opening rate. This may be due to the resistance of the hole sides and the relationship between the velocity distribution from the jet axis to the radial direction and the hole position. Furthermore, the velocity distribution in the jet impingement was obtained by PIV. It was found that the jet diffused radially downstream of the porous plate and that the jet diffused in the radial direction more than in the condition without the plate.
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Free Research Field |
安全工学
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Academic Significance and Societal Importance of the Research Achievements |
水素は最小着火エネルギーが小さく,可燃濃度範囲が広いため,水素の利用拡大における爆発リスクを低減するための対策が必要不可欠となる.そこで,水素漏えい時の爆発リスクを低減する方法として,本研究で効果が実証された多孔を有する障壁を設置する.無孔障壁では,壁の上流側で可燃濃度領域が形成されやすくなるが,多孔を有する障壁では,障壁上流の可燃濃度領域を縮小でき,さらに水平方向への噴流の拡散距離を短縮できる.そのため、水素エネルギー社会における安全性を向上し、社会的な貢献が期待される。また、多孔板へ衝突する噴流における運動量欠損と孔径および開孔率との関係が明確化され、学術的な進展も得られたと考える。
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