2023 Fiscal Year Final Research Report
Study on flow characteristics and interfacial transport mechanism in gas-liquid two-phase flow between fuel plates in research reactor
| Project/Area Number |
21K04941
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 31010:Nuclear engineering-related
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| Research Institution | Kyoto University |
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Principal Investigator |
Shen Xiuzhong 京都大学, 複合原子力科学研究所, 助教 (20362410)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 研究炉 / 熱流動 / 狭隘流路 / 気液二相流 / 界面積濃度輸送方程式 / ドリフトフラックスモデル / 気液二相流計測 / データベース構築 |
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| Outline of Final Research Achievements |
In this study, local measurements using advanced four-sensor probe method and image processing technique combining a high-speed camera were performed to investigate complex gas-liquid two-phase flows in narrow rectangular and arc-shaped channels simulating a research reactor fuel element, and a database of flow characteristics including the flow pattern and the void fraction, interfacial area concentration, and bubble diameter of two groups bubbles was constructed. Using the measured void fraction data and existing experimental data from other researchers, a new drift flux correlation equation applicable to the full flow range was developed and verified. Furthermore, using the measured interfacial area concentration data, the two-group bubble interfacial area transport equation and its related bubble coalescence and breakup models, proposed by Sun et al. (2004), were evaluated, and it was confirmed that they can be applied to safety analysis and evaluation codes for research reactors.
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| Free Research Field |
工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では、研究炉燃料要素実寸大の複数の模擬流路を製作し、その中に上昇する気液二相流を研究対象とし、三年間に渡って実験的研究とモデリング研究を行った。構築した高精度実験データベースは研究炉熱流動シミュレーションの質量、運動量、エネルギー保存則を閉じるための構成方程式の高度化とそのシミュレーション結果の妥当性検討（V&V）に重要である。開発した全流動範囲に適用できる新ドリフトフラックス相関式と検証した二群気泡界面積濃度輸送方程式と気泡合体・分裂モデルは、研究炉の安全解析・評価の予測精度向上に貢献できるため、研究炉の効率化及び経済性、安全性と使用済み燃料低減の問題解決に寄与することである。
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