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Flow structure of high Reynolds number flow in a dual-elbow piping simulating cold-legs of JSFR

JSFRコールドレグを模擬した2段エルボ配管における高レイノルズ数流れの流動構造

高村 宏行*; 江原 真司*; 金子 哲也; 山野 秀将  ; 橋爪 秀利*

Takamura, Hiroyuki*; Ebara, Shinji*; Kaneko, Tetsuya; Yamano, Hidemasa; Hashizume, Hidetoshi*

2D-PIVを用いてJSFRコールドレグ配管を模擬した流動可視化実験が0.3$$times$$10$$^{6}$$$$sim$$1.0$$times$$10$$^{6}$$幾つかのレイノルズ数を変えて行われた。試験体は立体的に直管に接続された2つのショートエルボがある。2段エルボ系では単エルボのように剥離領域から剥離渦が放出される。これらの渦は第二エルボの腹側とその下流を流れる。2段エルボ流れにおける超臨界域は単管エルボ系同様レイノルズ数が約0.5$$times$$10$$^{6}$$以上で現れる。

Flow visualization experiment with 2D-PIV in a dual elbow system simulating the cold-leg piping of the JSFR was performed varying Reynolds number from 0.3$$times$$10$$^{6}$$ to 1.0$$times$$10$$^{6}$$. The tested piping has two short elbows which are three-dimensionally connected with a straight pipe. In the dual elbow system, separation vortices are shed from the separated region like a single elbow one. These vortices flow by the inrados of the second elbow and its lower stream. The post-critical regime of the dual elbow flow appears when Reynolds number is larger than about 0.5$$times$$10$$^{6}$$, as with the single elbow system.

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