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Thermal Fluid-Structure Interaction Analysis of ShieldPlug(II); Verification of FLUSH by Two-Dimensional Model

熱流体-構造連成解析による遮蔽プラグ解析(II); 2次元モデルによるFLUSHの検証

宋 小明*; 大平 博昭

not registered; not registered

高速炉の炉上部構造におけるカバーガス領域の熱流力特性と遮蔽プラグの温度特性とを連成させて解析する熱流体-構造連成解析コード(FLUSH)を、大洗工学センターで過去に実施した実験結果を用いて検証した。解析では、ナトリウム液面を模擬したアルミニウムの高温面からの輻射伝熱をも考慮し、カバーガスの自然対流による熱流力特性と回転プラグを模擬した構造物の温度場とを2次元体系でモデル化し、実験で行われたナトリウムミストを含まない8ケースの条件とした。解析の結果、8ケースの実験条件に対して、カバーガス領域の流速及び温度分布と模擬回転プラグ内の半径方向及び軸方向の温度分布の両者が熱的に連続した状態で得られた。また、本8ケースではカバーガス領域と模擬回転プラグ間の境界温度は同傾向であり、境界温度の平均値は実験結果と1.3%以下の差で一致した。さらに構造物内の温度分布は、カバーガス自然対流による影響が支配的であり、輻射伝熱の効果は比較的小さくアルミニウム板の温度が400$$^{circ}C$$以下であれば無視できることがわかった。

In designing the shield plug of LMFBR, it is important to evaluate the thermal response between the cover gas thermal-hydraulics and the temperature fields of the shield plug at the same time. Based on the experiments which were performed by OEC, the natural convection and the thermal radiation in the cover gas layer were calculated with the structure simulating the shield plug in a detail two-dimensional model. The calculations were carried out for 8 kinds of experimental RUNs using a FLUSH code. The main results were as follows: (1)For these 8 kinds of experimental RUNs, the velocity and the temperature distributions in the cover gas layer were presented. The radial and axial temperature distributions in the rotating plug were also presented, which were difficult to measure by the experiments. (2)The boundary surface temperature between the cover gas layer and the rotating plug had the same tendencies and the calculated average temperatures on the boundary surface had good agreements with the experimental data. The average relative deviations from experimental values were less than 1.3%. (3)The natural convection of the cover gas enhanced the temperature distributions in the structure. The effects of thermal radiation on the heat transfer was relatively small and it can be neglected when the temperature of the heated aluminum disk is less than 400$$^{circ}$$C.

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