E211 T字合流部における渦構造と温度変動に関する実験研究(沸騰と噴流,OS8 軽水炉・新型炉・核燃料サイクル)

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This paper deals with the experimental investigation of thermal striping phenomena in a T-junction piping system as the typical part where influential temperature fluctuation in structural integrity may be induced by the thermal mixing. In this study, a simplified T-junction piping system consisting of a rectangular duct for main stream and a circular pipe for branch stream was used as the test section in the water experiment. Time series of instantaneous pictures in two-dimensional velocity vector field were obtained by PIV (Particle Image Velocimetry) technique in the mixing area. And fluid temperature fluctuations at several positions at 2 mm inside from the wall were also measured by thermo-couples. Focusing on the frequency characteristics, formation of eddy structure in the mixing area and mutual relation between the temperature fluctuation generation and the flow structure were discussed.
一般社団法人日本機械学会の論文
2009-06-28