F109 T字合流部における渦構造と温度変動に関する数値解析(OS7 軽水炉・新型炉・核燃料サイクル・バックエンド),動力エネルギーシステム部門20周年,次の20年への新展開)

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This paper deals with the numerical investigation of thermal striping phenomena in a T-junction piping system (T-pipe) as the typical part where influential temperature fluctuation in structural integrity may be induced by the thermal mixing. Numerical simulations for a T-pipe consisting of a rectangular duct for main stream and a circular pipe for branch stream were performed to investigate relation between large-scale eddy structure formation in the mixing area and temperature fluctuation generation on the wall. Moreover, water experiment and numerical simulation in the T-pipe to investigate thermal interaction between fluid and structure were conducted. In the experiment, temperatures at 2mm from the wall in fluid, on the wall and at 3mm inside from the wall in structure along a vertical trace line were measured simultaneously and they were compared with those of the numerical results. The numerical results indicate that the fluid-structure thermal interaction is necessarily considered for thermal fatigue estimation in the thermal striping phenomena.
一般社団法人日本機械学会の論文
2010-06-20