306 鉛ビスマスターゲットにおける液体金属流れの解析(S42-1 流れの可視化実験解析(1),S42 流れの可視化実験解析)  [in Japanese] 306 Analysis of Liquid Metal Flow for LBE Target  [in Japanese]

Ultrasonic Velocity Profiler (UVP) is a powerful tool to measure an instantaneous velocity profile especially on a velocity measurement of an opaque liquid flow, such as liquid metal. In this study, UVP is applied to a velocity field measurement of a fluid flow of Lead Bismuth Eutectic (LBE) in Accelerator Drive System (ADS). We performed velocity measurement on the centerline of the loop and confirmed basic performance of the loop. It was found that there was intermittent release of eddy from the re-circulation region formed on a wall surface of an inner cylinder and behind the edge. We made then a measurement for an angular direction of circumference around the central axis and observed 3-dimensional structure of LBE flow of the loop. From these results, we made clear that UVP is highly effective in a measurement of the flow field of liquid metal.