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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,45; 3段エルボ配管における旋回流流入時の流動場の詳細可視化

Study on flow-induced-vibration evaluation of large-diameter piping in a sodium-cooled fast reactor, 45; Visualization of the flow field in a triple elbow piping system under swirling inflow conditions

水谷 淳*; 江原 真司*; 橋爪 秀利*; 山野 秀将   

Mizutani, Jun*; Ebara, Shinji*; Hashizume, Hidetoshi*; Yamano, Hidemasa

次世代ナトリウム冷却高速炉の一次冷却系コールドレグ配管では、強い旋回流が流入し、複雑な乱流場が形成され、剥離渦放出に起因した圧力変動が想定される。本研究では旋回流生成器を用いて、様々な入口旋回流に対するエルボ内部および下流の流れ場を、特に時間平均場について実験的に調べた。

In a cold-leg piping of the primary cooling system of next-generation sodium-cooled fast reactors, pressure fluctuations induced by vortex shedding are expected as well as the inflow of strong swirling flow and the formation of complicated turbulent flow. This study experimentally investigated flow fields, in particular time-averaged fields, inside the elbow and in its downstream under various swirling inflows using a swirling flow generator.

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