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高速炉におけるガス巻込み現象の防止基準,2; ガス巻込み発生判定手法の提案

Standard for prevention of gas entrainment phenomena in fast reactors, 2; Proposal of gas entrainment evaluation method

大島 宏之; 江口 譲*; 功刀 資彰*; 上出 英樹; 堺 公明; 伊藤 啓

Ohshima, Hiroyuki; Eguchi, Yuzuru*; Kunugi, Tomoaki*; Kamide, Hideki; Sakai, Takaaki; Ito, Kei

ナトリウム冷却高速増殖炉の安定運転のためには、ガス巻込み発生を許容レベル以下に抑制する必要があり、設計検討において、ガス巻込み発生を精度よく評価できる手法が必須である。本研究では、流速分布(速度勾配テンソル)に基づいて渦流れの抽出やガス巻込み評価パラメーター(ガスコア長さなど)の計算を行う手法の提案を行う。加えて、実験結果の分析に基づき、渦によるガス巻込み発生を防止するための基準を先の評価パラメーターを用いて構築し、実際に適切な評価結果が得られることを示す。

For the stable operation of fast breeder reactors (FBRs), the occurrences of gas entrainment (GE) phenomena should be suppressed below an allowance level. Therefore, a reliable evaluation method for the GE phenomena is necessary to determine the operating conditions of FBRs. In this paper, the authors propose a GE evaluation method in which free surface vortices are identified from velocity fields by using the second invariant of velocity gradient tensor, and the GE evaluation parameters, e.g. gas core length, are calculated by using the Burgers vortex model. In addition, the standard for prevention of three kinds of the vortex-type GE are shown in consideration of experimental data, evaluation results with the proposed method and the comparison results of them. Finally, it is confirmed that the onset conditions of the vortex-type GE can be evaluated by the proposed method.

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