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サーマルストライピングによる構造物の周波数応答ナトリウム実験

Frequency response experiments for a fluid and structure interaction system due to thermal striping in sodium

山形 保男*; 小澤 一雅*; 床井 博見*; 森田 博*

not registered; Ozawa, Kazumasa*; not registered; not registered

サーマルストライピングによる構造物の周波数応答ナトリウム実験において、温度振動周波数を制御し、低温及び高温のナトリウム噴流をナトリウム中に設置した構造材表面に交互に流出させて、噴流場でのナトリウムと構造材内部それぞれの温度を同時計測し、熱サイクルの違いによる温度振幅挙動を明らかにした。(1)高温用と低温用のナトリウムバルブを交互切換えによって、0.01Hz$$sim$$0.2Hz、温度差240$$^{circ}C$$の高低温ナトリウム交互噴流の生成を実証した。(2)ナトリウム中の温度振幅の変動とゆらぎは、周波数を小さくすると減少する。(3)構造材内部の温度振幅は、ナトリウム中に比べ極端に減衰する。(4)構造材内部の温度振幅は、低周波数ほど大きくなり周波数に反比例する。(5)構造材内部の温度振幅の変動は、周波数が小さい程少ない。(6)微細な温度ゆらぎは、高周波数側では大きいが、構造材表面近傍に限定される。(7)微細な温度ゆらぎは、低周波数側では小さいが、構造材内部にまで浸透する。

Thermal striping phenomena induced by the alternate flows of cold and hot sodium impinging against a horizontal test piece surface were investigated. The temperatures of sodium and structure material were measured simultaneously using thermocouples located various positions. From the present experiments, the following results have been obtained. (1)The alternate flows of cold and hot sodium with the frequency from 0.01Hz to 0.2Hz and the temperature difference of 240$$^{circ}$$C were composed using the opening and closing operations of a cold and a hot sodium valve alternately. (2)The change and fluctuation of temperature amplitude in sodium decreases with decreasing of frequency component. (3)Amplitude component of temperature vibration decreased extremely in the structure material inside of the test piece than sodium. (4)Amplitude component of temperature vibration in the structure material increases in inverse proportion to decreasing of frequency component. (5)Amplitude component change of temperature vibration in the structure material decreases with decreasing of frequency component. (6)Fine fluctuations of temperature vibration in the structure material increases with increasing of frequency component, but it was limited near the surface of material. (7)Fine fluctuations of temperature vibration in the structure material decreases with decreasing of frequency component, but it was penetrated into the deep inner part of the material.

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