CIP-Level set法によるヘリカルコイル管内気液二相流の三次元解析

3-dimentional numerical simulation in helically coiled tube by CIP-Level set method

大岩 浩司; 吉川 信治 

Oiwa, Hiroshi; Yoshikawa, Shinji

もんじゅのヘリカルコイル型蒸発器では管内気液二相流に作用する遠心力により複雑な二次流れが生じると思われる。本研究ではCIP-Level set法を用いた数値解析により遠心力の作用と流れ場との関係について明らかにする。

Helically coiled heat transfer tubes are used in the steam generator of Fast Breeder Reactor "Monju". The characteristics of this steam generator is affected by the centrifugal acceleration due to curvature of the heat transfer tube. The centrifugal acceleration forces the liquid phase to the wall of the tube. This phenomenon suppresses the rapid boiling that may induce the hydrodynamic oscillation. In this study, the effect of centrifugal acceleration and inlet conditions of the fluid is investigated by numerical simulation using CIP-level set method. We focused on the slug flow regime in which centrifugal acceleration dominates the flow. The present study showed two types of the centrifugal acceleration effects. One is the effect that holds the liquid phase near the tube wall, and another is the liquid-covering effect on the wall by secondary flow.