Study on behavior of vortex cavitation around suction pipes in sodium-cooled fast reactor geometry

高速炉体系の吸込み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

江連 俊樹 ; 伊藤 啓; 上出 英樹 ; 功刀 資彰*

Ezure, Toshiki; Ito, Kei; Kamide, Hideki; Kunugi, Tomoaki*

Vortex cavitation behavior is studied using a 1/22 scaled upper plenum water model of advanced loop-type sodium-cooled fast reactor. Vortex cavitation occurrences are quantitatively grasped through visualization measurements including its transient behavior under various conditions of inlet velocity of suction pipe, water temperature and system pressure. In addition, the relation between local velocity around vortex and vortex cavitation occurrences are investigated based on results from visualization and Particle Image Velocimetry measurements. Experimental results show the difficulty of evaluation of vortex cavitation occurrences simply based on cavitation factor. And also, vortex evaluation with local circulation shows the effectiveness to organize the vortex cavitation occurrences via the evaluation of pressure decrease using vortex model.