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Flow visualization and frequency characteristics of velocity fluctuations of complex turbulent flow in a short elbow piping under high Reynolds number condition

高レイノルズ数条件における単エルボ配管の複雑乱流の速度変動の周波数特性と流れの可視化

高村 宏行*; 江原 真司*; 橋爪 秀利*; 相澤 康介 ; 山野 秀将  

Takamura, Hiroyuki*; Ebara, Shinji*; Hashizume, Hidetoshi*; Aizawa, Kosuke; Yamano, Hidemasa

二次元PIVを用いて、JSFRコールドレグ配管の1/7縮尺である一段ショートエルボ配管の流動可視化実験が行われた。その目的は、高レイノルズ数での流速変動の周波数特性やエルボ腹側に現れる流動剥離に関連する微細流動場を調べことである。レイノルズ数を変えても、St=0.5の周期的な動きが剥離近傍で現れた。

By means of 2D PIV (2-dimensional Particle Image Velocimetry), flow visualization experiments are carried out for a single short elbow piping which is a 1/7-scale model of the cold-leg piping of Japan Sodium-cooled Fast Reactor in order to investigate the minute flow field related especially to flow separation appearing in the intrados side of the elbow and frequency characteristics of the flow velocity fluctuation for various Reynolds number flow. A periodic motion with St of 0.5 appeared near the separation region if the Reynolds number changes.

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パーセンタイル:75.55

分野:Engineering, Mechanical

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