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Gas entrainment in sodium cooled FBR: preliminary simulation for 1:1.8 scale water upper plenum experiment by AQUA-VOF

AQUA-VOFコードによるガス巻込み現象に関する予備的解析

Kriventsev, V.; 大島 宏之

Kriventsev, V.; Ohshima, Hiroyuki

ナトリウム冷却炉の設計研究において、炉容器内自由液面からのガス巻込みを防止するため水流動スケール試験が実施されるとともに、これらの試験の条件設定や結果の解釈支援、およびガス巻込み現象の解析手法確立を目指して、いくつかの数値解析手法の適用性研究が行われている。本研究は、上部プレナム液面近傍試験モデルの一部を簡易的に模擬した体系を用いて、AQUA-VOFコードの適用性について確認を行うとともに、流況と自由液面挙動の関連について考察を行った。

Prevention of gas entrainment from the free surface of sodium pool is one of the important problems to solve during feasibility study of commercial fast breeder reactor (FBR). Numerical calculation and experiment should clear clarify conditions when gas entrainment is likely to occur and help in developing the reactor design that can prevent it. In this report, we present the results of AQUA-VOF program that simulated 1:1.8 scale experimental model with water as working fluid. The main question to be answered is whether the effect of free surface is important for gas-entrainment occurrence prediction and whether it must be included in accurate, boundary-fit codes like SPIRAL. In addition, we present here preliminary considerations of gas entrainment phenomena and most important factors to study in experiment.

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