2216 高速炉における高サイクル熱疲労に関する研究(2) T 字管水試験による混合現象の解明

概要

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A water experiment for thermal hydraulics in a mixing tee was performed to investigate thermal striping phenomena. The flow patterns of jet exiting from the branch pipe could be classified into (1) wall jet (2) deflecting jet and (3) impinging jet according to the inflow condition. The parameter experiments showed that the jet form could be predicted by a momentum ratio between the two pipes. From the temperature measurement test, the spatial distribution of temperature fluctuation near the wall depended on this flow pattern in the tee. In the wall jet, temperature fluctuation was high at the both side edges of the cold spot. The temperature fluctuation at the side edge had a prominent frequency. Power spectrum density (PSD) of temperature fluctuation at a certain point normalized by Vm/Db had unique profile versus St number including the prominent frequency, when the momentum ratio was given. The analysis using direct numerical simulation (DNS) code, DINUS-3 was performed to understand effect of scale on temperature fluctuation frequency characteristics.
社団法人日本機械学会の論文
2003-08-05