T字合流配管における壁温度変動の数値シミュレーションによる再現

抄録

Thermal fatigue may occure at mixing tees where high and low temperature fluids flow in and mix. The authors have tried to develop numerical methods to predict thermal fatigue. In this study, a large eddy simulation was carried out to investigate the predictive performance of the flow and temperature fields and temperature fluctuation on the wall surface at a mixing tee. The simulation target was the mixing-tee experiment called T-cubic experiment performed at the Institute of Nuclear Safety System, Inc. Computational domain included 304 type stainless steel pipe as well as working fluid of water. Time-averaged velocities and fluid temperature distributions could be predicted well. Fuctuated temperatures on the wall surface downstream from the mixing tee agreed well with the experimental data. This indicated that the temperature fluctuation on the wall inner surface can be predicted by numerical simulation. These predicted data can be used for the thermal stress analysis for the future work.