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Report No.

Experimental study on vortex cavitation in scaled upper plenum model of Japan Sodium-cooled Fast Reactor, 1; Evaluation of circulation and vortex cavitation occurrences using vortex model

Ezure, Toshiki ; Ito, Kei; Kameyama, Yuri*; Hagiwara, Hiroyuki*; Kamide, Hideki 

A water experiment in the 1/22 scaled upper plenum model of JSFR was performed to clarify behavior of vortex cavitation occurrences. Velocity distributions between H/L intakes and R/V wall were obtained under various H/L inlet velocity and temperature conditions. Pressure drop at vortex center was evaluated from obtained velocity distributions based on the Burgers vortex model. Evaluated value of pressure drop in time series was also compared with temporal behavior of vortex cavitation occurrences. As the results, circulation around vortex was quantified and time-averaged normalized circulation was observed to be nearly constant independent on the variation of Reynolds number at H/L pipe intakes. The evaluated value of pressure drop showed qualitatively consistent behavior to occurrences of vortex cavitation in time series. Consequently, it is confirmed that occurrences of vortex cavitation can be predicted by means of the evaluation method based on Burgers vortex model.



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