検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

Transient behavior of gas entrainment caused by surface vortex

自由表面渦によるガス巻き込み現象の過渡現象に関する研究

江連 俊樹; 木村 暢之; 林 謙二; 上出 英樹

Ezure, Toshiki; Kimura, Nobuyuki; Hayashi, Kenji; Kamide, Hideki

コンパクトなナトリウム冷却炉は高速増殖炉の重要な候補の一つであり、実用化のための研究が行われている。炉容器径のコンパクト化に伴って、ナトリウム冷却材自由表面からのガス巻き込みが設計上の重要な問題の一つとなっており、評価手法や裕度を明らかにすることが必要である。本研究では、水-空気の実験体系にて、自由表面渦によるガス巻き込み現象とその過渡変化に着目して可視化による実験を行った。加えて、循環とガスコア長過渡的な変化の様子を粒子画像流速測定法と渦の可視化を用いて計測した。結果、ガスコア長は渦周囲の循環の発達に遅れて発達することを見いだした。

A compact sodium cooled reactor is one of important candidates as FBR and has been investigated in the feasibility study of FBR cycle. According to the compact sizing of reactor vessel, gas entrainment at the free surface of sodium coolant becomes one of the significant issues for reactor design, and it is required to clarify the criterion of gas entrainment at free surface and the tolerance. In the present study, some visualization experiments were performed in a water-air system focusing on the gas entrainment due to surface vortex and its transient phenomena. Influences of horizontal velocity were clarified by the visualization. Trends of circulation and length of gas core during transient phenomena of the gas entrainment were also measured by the particle image velocimetry and visualization. It was found that the gas core length extends with time delay to the increase of circulation around the vortex.

Access

:

- Accesses

InCites™

:

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.