配管要素の組み合わせにより発生した旋回流の配管減肉に与える影響について

英字タイトル:
EFFECT OF SWIRL FLOW GENERATED BY THE COMBINATION OF PIPE ELEMENTS ON WALL THINNING PHENOMENA
著者:
山本啓 Kei YAMAMOTO 鈴木翔太 Shota SUZUKI 中村隆夫 Takao NAKAMURA 米田公俊 Kimitoshi YONEDA 渡辺瞬 Syun WATANABE
発刊日: 2013年7月24日
公開日: 2019年6月28日

カテゴリ: 第10回

キーワードタグ:
combination of pipe elementsflow accelerated corrosionmass transfer coefficientswirl flow

概要

Flow accelerated corrosion (FAC) is the major pipe wall thinning phenomena in power plants. The management of pipe wall thinning has been carried out to pipe elements such as elbow, orifice, etc. of the piping system in power plants. In piping system, it is known that several pipe elements which are connected in series may generate swirl flow. Therefore the arrangement of pipe elements is considered to affect thinning phenomena seriously. So the behavior of this swirl flow is one of the major research targets to improve the accuracy of simulation codes. In Mihama Unit3 pipe failure accident in 2004, it was pointed out the swirl flow caused by the piping layout might influence the thinning rate behind orifice. This study focuses on the behavior of main stream of swirl flow and reviews the effect to swirl number and turbulent kinetic energy distribution and the relation to pipe wall thinning.