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Preliminary experiments with an underexpanded gas jet into water

水中の気体不足膨張噴流に関する予備試験

内田 光則*; 染矢 聡*; 岡本 孝司*; 大島 宏之

Uchida, Mitsunori*; Someya, Satoshi*; Okamoto, Koji*; Ohshima, Hiroyuki

ナトリウム冷却高速炉蒸気発生器の伝熱管破損時安全評価を目的として、ナトリウム-水化学反応を伴う噴流の挙動や、その影響で発生する周辺伝熱管ウェステージ現象を評価するための数値解析手法を開発している。解析手法の開発において、液体中への高圧気体噴出挙動を解明するとともに検証用データを取得することが重要な課題となっていることから、本研究では、水中空気不足膨張噴流の可視化実験を実施した。実験により、噴流形状,到達距離,拡がり角度,周囲液体の連行挙動,噴流中の液滴速度等、解析手法の検証に有用なデータを取得した。また、空気側圧力の変化が噴流の挙動に及ぼす影響を明らかにした。

When a heat exchanger in fast breeder reactor cracks, a sodium-water reaction occurs. Highly pressurized water or steam escapes into the surrounding liquid sodium. The release of steam into the liquid sodium media is a two-phase flow with an underexpansion. Several studies have examined only the underexpansion of the gas-gas phase. However, there are few reports on the underexpansion of the gas-liquid phase. In this study quantitative measurement was carried out for the purpose of revealing the flow with the underexpanded gas jet injected into water. The gas jet distance and the expansion angle were then obtained from the averaged images of a high-speed camera. The gas jet distance and the expansion angle increased approximately linearly with increasing pressure. The entrainment velocity and the velocity of entrained water droplets into the gas jet were obtained by PIV.

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