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Study on flow-induced-vibration evaluation of large-diameter pipings in a sodium-cooled fast reactor, 4; Experiments on the 1/10-scale hot leg test facility in Reynolds number of 50000 and 320000

Na冷却高速炉における大口径配管の流力振動評価に関する研究,4; Re=50000と320000におけるホットレグ1/10縮尺試験

岩本 幸治*; 保田 和則*; 十河 基介*; 山野 秀将; 小竹 庄司

Iwamoto, Yukiharu*; Yasuda, Kazunori*; Sogo, Motosuke*; Yamano, Hidemasa; Kotake, Shoji

JSFRに採り入れられるホットレグ配管の1/10縮尺モデルを用いて、圧力測定,レーザードップラー流速計計測と流動可視化を実施した。Re=50000を用いたLDV計測により、(1)エルボ入口から45度からエルボ出口から下流に配管直径の0.3倍の位置まで流動剥離が見られた。(2)本研究では、2種類の変動が現れた。Re=320000の場合、流れの慣性が逆圧力勾配より優勢になるため、エルボ下流の流動剥離高さが小さくなることがわかった。

Pressure measurement, laser Doppler velocimetry (LDV) and flow visualization were carried out using the 1/10-scale model of a hot leg piping installed in a Japanese sodium-cooled fast breeder reactor. LDV measurement with Reynolds number of 50000 showed the following results: (1) A flow separation was confirmed in the region between 45 degrees from the elbow inlet and 0.3 times of pipe diameter downstream of the elbow. (2) There appeared two kinds of fluctuations in the present study. In the case of Reynolds number of 320000, it was found that the height of the flow separation downstream of the elbow became smaller, since the inertia of the flow became superior to the inverse pressure gradient.

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