원통 내부에 배열된 외곽 전열관의 유체 부가질량계수 해석

Abstract

ABSTRACT According to the wear detection history for the steam generator tubes in the nuclear power plant, the outer tubes inside the steam generator have more problems on the flow-induced vibration than inner tubes. Many researchers and engineers have used a specified added mass coefficient for a giv-en tube array during the design stage of the steam generator even though the coefficient is not con-stant for entire tube in cylindrical shell. The aim of this study is to find out the distribution of add-ed mass coefficients for each tube along the radial location. When numbers of tubes inside a cylin-drical shell are increased, values of added mass coefficients are also increased. Added mass co-efficients at outer tubes are less than those of inner tubes and they are decreased with increasing the gap between the outermost tube and the cylindrical shell. It also turns out when the gap between the outermost tube and the cylindrical shell approaches infinite value, the added mass coefficient con-verges to an asymptotic value of given tube array in a free fluid field.