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PIV measurement of a flow field in a narrow gap between wire-wrapped fuel rod in FBR

ワイヤ付き燃料ピンバンドル体系内狭隘流路の速度場PIV計測

越智 大輔*; 染矢 聡*; 大島 宏之; 岡本 孝司*

Ochi, Daisuke*; Someya, Satoshi*; Ohshima, Hiroyuki; Okamoto, Koji*

高速増殖炉の高い安全性・効率を確保するには、高精度な熱流動数値解析手法の開発、及び、実測データを用いた数値解析手法の検証が必要である。本研究では、数値解析手法検証用のデータを取得することを目的に、高速増殖炉燃料ピンバンドルを模擬した7本ピンバンドル体系熱流動計測装置を用い、PIVによる速度場計測を実施した。ヒーター加熱有り/無し、あるいは、流量を変更したそれぞれの条件において、燃料ピン間の狭隘流路における流速データを取得することに成功した。

It is important to advance safety and efficiency of the FBR. A numerical prediction method of high accuracy and its validation with a simulated thermal flow field are indispensable. A wire-wrapped rod bundle system, which briefly simulated the fuel rods system in FBR, was built up in the experiments. The wire-wrapped rods were made from Mexflon-material, of which refractive index was exactly same with that of water. The particle image velocimetry was applied to measure the velocity field in the narrow gap between wire-wrapped rods, under variable flow rates with or without heating rods. The aim of this study was to contribute to the certification of results of numerical simulation for the safety design of the FBR.

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