C203 オリフィス下流域での管壁の減肉現象とその低減に関する研究(OS6 流れ加速型腐食)

概要

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In a piping system of power plant, the pipe wall thinning by Flow Accelerated Corrosion, FAC, Liquid Droplet Impingement Erosion, LDI, and Cavitation Erosion, C/E, are very serious problems because they give a damage and lead to the destruction of the piping system. This paper examined the pipe wall thinning by FAC in the downstream of orifice nozzle. The characteristics of FAC, generation mechanism, and prediction of the thinning were made clear experimentally and the reduction method was proposed and confirmed. As a results, it was made clear that the thinning is occurred mainly by the pressure fluctuation p' on the pipe wall and can be estimated by p', and the suppression of p' can be realized by replacing the orifice to a taper shaped one having an angle to the upstream.
一般社団法人日本機械学会の論文
2011-06-22