0602 流れ加速型腐食に対する局所的な流動の影響の検討(S45-1 原子炉システムおよびその要素技術(1),S45 原子炉システムおよびその要素技術)

概要

論文の詳細を見る
Experiments were conducted to investigate the basic mechanism of Flow Accelerated Corrosion (FAC), which is a main cause of pipe wall thinning phenomena in power plants. FAC was observed in a contracted rectangular duct where carbon steel test specimen was installed. FAC thinning rate was measured optically by laser displacement sensor and time variance data of thinning surface geometry were obtained. In parallel, numerical calculation was also conducted to clarify the local flow field affecting FAC in the experiment system. Maximum thinning rate showed a trend proportional to the square of mean velocity in terms of contraction flow in a pipe or a duct. Local thinning rate showed a proportional trend to both local velocity and fluctuation velocity on the surface, except few exceeded thinning data. For future prediction of quantitative thinning rate, effects of local average velocity and local turbulence must be evaluated separately in the FAC experiments.
社団法人日本機械学会の論文
2007-09-07