Numerical Analyses of Flashing Jet Structure and Droplet Size Characteristics
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概要
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In this paper, flashing jets are numerically simulated using the MPS method. The boiling mode for flashing is identified as surface boiling mode, based on the postulation of jets from a short nozzle under high depressurization. The Homogeneous Non-equilibrium Relaxation Model (HRM) is used for calculating the evaporation rate of flashing. The numerical simulation results show that flashing jets comprise an inner intact core which is surrounded by two-phase droplet flow. The effect of degree of superheat on the jet topological geometry is investigated. With increasing degree of superheat, the topological shape of flashing jets evolves from cylindrical core for low degree of superheat to cone-shaped core for high degree of superheat, and meanwhile the extinction length comes to decrease and tends asymptotically constant as the injection temperature approaches the saturation temperature corresponding to the injection pressure. The analyses of the droplet size distribution engendered from primary breakup of flashing jets show that: two peaks exist for droplet size distribution at lower degree of superheat; however, merely one peak for higher degree of superheat. From droplet size distribution, it is revealed that the primary breakup mechanism of flashing jets can be attributed to dominant mechanical breakup mode plus enhancement via surface evaporation.
- 社団法人 日本原子力学会の論文
- 2006-03-25
著者
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越塚 誠一
東京大学大学院 工学系研究科 システム創成学専攻
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岡 芳明
東京大学
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岡 芳明
東大
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Koshizuka Seiichi
Nuclear Engineering Research Laboratory The University Of Tokyo
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岡 芳明
東京大学大学院工学系研究科附属原子力工学研究施設
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DUAN Ri-qiang
Institute of Nuclear and New Energy Technology, Tsinghua University
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JIANG Sheng-yao
Institute of Nuclear and New Energy Technology, Tsinghua University
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OKA Yoshiaki
Nuclear Engineering Research Laboratory, The University of Tokyo
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YAMAGUCHI Akira
O-arai Engineering Center, Japan Nuclear Cycle Development Institute
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TAKATA Takashi
O-arai Engineering Center, Japan Nuclear Cycle Development Institute
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Duan Ri
Nuclear Engineering Research Laboratory The University of Tokyo
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Takata Takashi
Osaka Univ.
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Takata Takashi
O-arai Engineering Center Japan Nuclear Cycle Development Institute
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岡 芳明
東大原子力工学研究施設
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岡 芳明
東京大学原子力グローバルCOE
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Jiang Sheng-yao
Institute Of Nuclear And New Energy Technology Tsinghua University
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Oka Yoshiaki
Nuclear Professional School The University Of Tokyo
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Oka Yoshiaki
Department Of Nuclear Engineering And Management University Of Tokyo
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Oka Yoshiaki
Nuclear Engineering Research Laboratory Graduate School Of Engineering The University Of Tokyo
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Duan Ri-qiang
Nuclear Engineering Research Laboratory The University Of Tokyo
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Oka Yoshiaki
Nuclear Engineering Research Laboratory University Of Tokyo
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岡 芳明
Nuclear Professional School The University Of Tokyo
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Takata Takashi
Department Of Energy And Environment Engineering Osaka University
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Yamaguchi Akira
O-arai Engineering Center Japan Nuclear Cycle Development Institute
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