B108 弁下流の流れ場のLDV計測と可視化(流れ加速型腐食・***ージョン・振動,OS6 保全・設備診断技術)

概要

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In this study, in order to understand flow fields downstream of a valve, an acrylic test section of a globe valve was made and velocity profiles were measured by laser Doppler velocimetry (LDV). Flow visualization by ink was also conducted. The diameter D of a downstream pipe is 50 mm, and mean cross-sectional velocity was set to 3.54 m/s in LDV measurement, 0.453 m/s in flow visualization, respectively. Horizontal or vertical velocity profiles were found asymmetric. Flow velocity around the lower wall near the outlet of the valve was accelerated. Velocity near the center axis of the pipe was lower than that near the pipe wall, which is a characteristic of swirl flow. Existence of swirl flow was also confirmed by flow visualization. Velocity profiles approached fully developed turbulent profile at downstream after 7D.
2009-06-28