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Report No.
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Analysis of cavitation in downstream conduit with high-speed liquid Li target flow for fusion neutron source

Hirakawa, Yasushi ; Furukawa, Tomohiro  ; Park, C.-H.*; Kondo, Hiroo*; Oyaizu, Makoto*

A cavitation phenomenon-like acoustic noise was reported in the downstream conduit of Li target assembly of the IFMIF/EVEDA lithium test loop (ELTL), which aims to verify the Li target being intended for use as a beam target for the intense fusion neutron sources. To clarify the cause of this cavitation phenomenon, we found that acoustic emissions due to cavitation occurred in a narrow area near the start of the bend-pipe where the Li target impinged by using acoustic-emission sensors. And the method to determine this conflict location was formulated. We evaluated the applicability of the proposed numerical method by simulating the cavitation phenomenon occurring in the downstream conduit of the ELTL. As a result, the area of occurrence of the cavitation phenomenon was estimated by specifying the area of decompression/boiling inside the liquid Li and the point of collision with the inner wall of the conduit. And the collision point was the same as the specific position using the AE sensor. In addition, a more stable and easy-to-maintain design was proposed by using a tilted straight-type's downstream conduit to suppress the occurrence of cavitation.

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