Measurement of free surface of liquid metal lithium jet for IFMIF target

IFMIFターゲットのための液体金属リチウムジェットの自由表面の測定

近藤 浩夫*; 金村 卓治*; 山岡 信夫*; 宮本 斉児*; 井田 瑞穂; 中村 博雄; 松下 出*; 室賀 健夫*; 堀池 寛*

Kondo, Hiroo*; Kanemura, Takuji*; Yamaoka, Nobuo*; Miyamoto, Seiji*; Ida, Mizuho; Nakamura, Hiroo; Matsushita, Izuru*; Muroga, Takeo*; Horiike, Hiroshi*

IFMIFのためのリチウム流実験を大阪大学で実施し、二段絞りノズルで形成される厚さ10mm,幅70mmの平板状リチウム流を流速15m/sまで試験した。本論文ではパターン投影法について報告する。これは縞状パターンを流れ表面に投影して非接触で行う映像測定法である。流れ表面の高低に応じて歪む投影パターンを観測し、それを解析することにより三次元的な表面形状が求まる。この測定法により、リチウム流により鋸歯状に侵食されたノズル出口から発生する航跡の観測に成功した。

Lithium flow experiments were conducted for International Fusion Materials Irradiation Facility (IFMIF) at Osaka University. In the experiment, Li plane jet of 10 mm in depth and 70 mm in width formed by a two contractions nozzle was tested in the velocity range of less than 15 m/s. In the present report, Li surface measurement by pattern projection method was tested. This is a three dimensional image measurement, where stripe patterns are projected onto the flow surface without touching it. The projected patterns were observed to be deformed according to the surface up- and- down. Three-dimensional surface shape could be obtained by analyzing the deformed patterns. By the method, shapes of wave pattern called surface wakes were successfully measured. The surface wakes were observed to be formed from the nozzle edge. It was found that the nozzle edge was damaged and became serrated after lithium flowing of 1,300 hours at this moment.