ナトリウム冷却高速炉ホットレグ配管入口部における液中渦キャビテーションに関する研究,3; 複雑体系における液中渦発生条件への粘性の影響

Study on cavitation due to sub-surface vortex at intake of hot-leg pipe in sodium cooled fast reactor, 3; Influences of kinematic viscosity on vortex cavitation occurrences in complicated geometry

江連 俊樹 ; 伊藤 啓; 小野島 貴光; 木村 暢之; 上出 英樹 

Ezure, Toshiki; Ito, Kei; Onojima, Takamitsu; Kimura, Nobuyuki; Kamide, Hideki

JSFR炉上部プレナムと相似な形状を持つ1/22縮尺の水試験装置にて、加圧量,流速及び粘性を試験パラメータとして変化させた試験を実施し、可視化によって発生条件を把握した。今回の試験範囲では、既報の基礎試験の低無次元循環条件下で見られたように、圧力及び粘性それぞれが減少するにつれて、キャビテーションが発生しやすくなる結果となった。

The occurrence conditions of vortex cavitation were examined in the 1/22 scaled water model experiment which has similar geometry to the upper plenum of JSFR. In the experiments, visualization measurements of vortex cavitation were performed under the various pressure, velocity and kinematic viscosity conditions to grasp those influences on the occurrence of vortex cavitation. The experimental results show that vortex cavitation occurs easily with the decrease of pressure and kinematic viscosity. Thus, the present experimental results were consistent to the results which were seen in the relatively low normalized circulation cases of the previous fundamental water experiment.