超高速二相流によりオリフィス下流域に発生するエロージョン現象の解明（２）
Analysis (2) of Liquid Droplets Impact Erosion at the orifice downstream area caused by supersonictwo-phase flow
著者:
梅原 真弘 Masahiro UMEHARA 阿部 祐子 Yuko ABE 結城 和久 Kazuhisa YUKI 戸田 三朗 Saburo TODA 秋葉 真司 Shinji AKIBA
発刊日:
公開日:
ErosionFlow Accelerated Corrosion(FAC)Liquid Droplets Impingement(LDI)OrificeTwo-Phase FlowWall Thinning
概要
Pipe wall thinning is one of the most important technical problems in nuclear power plants. For example, the wall thinning occurs by two-phase flow at both the orifice downstream and the first elbow located downstream after the orifice. In this study, a visualization experiment was conducted in order to clarify the detailed mechanism of the wall thinning by erosion (LDI is expected) in the piping system consisting of an orifice, a straight pipe and an elbow.In the experiment a strong pressure at the down stream elbow was observed when a droplet jet was formed at the orifice. This showed that the impingement of the droplet jet was considered to cause the LDI erosion at the elbow. On the other hand strong shear flow was observed from our experiment at the downstream immediately after the orifice, where occurrence of the wall thinning was reported in the actual system. This result strongly indicates that the wall thinning in the downstream pipe of the orifice is not caused by the LDI erosion but by the FAC
