103 配管の熱疲労評価法の高度化を目的とした配管合流部の温度変動の数値解析(OS1-1.数値シミュレーションの原子力への応用(1),OS・一般セッション講演)

Abstract

Thermal fatigue may occur at a T-junction pipe where the high and low temperature fluids mix. A numerical simulation was conducted to simulate temperature fluctuation at the T-junction pipe using detached eddy simulation (DES) in this study. The results of simulations were compared to a case measured in the WATLON experiments performed by the Japan Atomic Energy Agency in which case was done with a wall jet condition that the jet from a branch pipe flowed near the main pipe wall. The calculated temperature fluctuation in water and its frequency showed good agreement to the measured data at the location of one main pipe diameter from the junction point. The unsteady heat transfer was calculated by the water temperature at 1mm from wall and the wall temperature at 0.1mm from walL surface and was compared to the data in the Japan Society of Mechanical Engineers' standard, "Guideline for evaluation of High-Cycle Thermal Fatigue of a Pipe, JSME S017".