サーマルストライピング現象の熱流動に関する研究; 壁面噴流Na/水試験および準DNSを用いたNaと水の混合特性比較評価

Study on Thermalhydraulics in Thermal Striping Phenomena; Evaluation on Convective mixing in Sodium and Water based on Sodium/Water Experiments and Quasi-DNS

木村 暢之; 長澤 一嘉*; 三宅 康洋*; 宮越 博幸; 上出 英樹 

Kimura, Nobuyuki; Nagasawa, Kazuyoshi*; Miyake, Yasuhiro*; Miyakoshi, Hiroyuki; Kamide, Hideki

流体の温度変動に伴う高サイクル熱疲労の熱流動現象について、壁に沿った平行3噴流体系のNa、水試験、準DNSを用いた試験解析によるNaと水の温度変動特性の比較を行った。その結果、構造物の近傍ではNaの方が温度変動強度が小さく、水試験により保守的に温度変動特性を評価できることを示した。

Sodium and watrer experiments on thermal striping phenomena were carried out. Triple-parallel jet along a wall was investigated. Further, quasi-DNS was also performed and comparisons between experiments and analyses were carried out. Temperature fluctuation intensity near the wall was larger in water than in sodium. This means that water experiment can predict sodium temperature fluctuation intensity with certain conservative factor.