A108 オリフィス下流における流れ加速型腐食の評価 : 1. 流れ場の計測と数値解析(配管減肉(FAC),OS6 保全・設備診断技術(1),一般講演,地球温暖化防止と動力エネルギー技術)

概要

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In this study, in order to evaluate the effects of flow field on corrosion rate due to flow accelerated corrosion (FAC), an orifice flow was measured and calculated. The diameter of pipe is 50 mm and that of the orifice is 24.3 mm, and flow velocity in a water loop was set at 2.41 m/s. Flow field was measured by laser Doppler velocimetry (LDV) and particle image velocimetry (PIV), and compared with a calculation for the same flow conditions. Measurements of wall shear stress downstream of the orifice was also planed. The calculated velocity distributions of standard k- agreed qualitatively with PIV data and quantitatively with LDV data. Instantaneous flow field measured by PIV showed vortices around the jet from the orifice and some of them reached near the pipe wall.
2008-06-18