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高速炉ガス巻込み現象に関する数値的研究

Numerical study on gas entrainment phenomena in fast reactor

伊藤 啓; 大島 宏之

Ito, Kei; Ohshima, Hiroyuki

高速増殖炉の実証炉設計研究において、炉上部の自由液面におけるガス巻込み(液面から気泡が巻込まれる現象)の発生が懸念されている。ガス巻込み現象は、局所体系形状及び流速分布に依存するため、実機レベルの現象を完全に再現することは困難であるが、実験室レベルの現象を対象として、ガス巻込み現象の傾向を調査・検討することは可能であると考えられる。本報は、ガス巻込み基礎実験を対象とし、境界条件や体系形状を変化させた場合のガス巻込み挙動の変化を、数値解析によって評価し、ガス巻込みの支配パラメータに関して検討した。

Gas Entrainment (GE) phenomena in the basic experimental apparatus were studied numerically to make clear the dominant parameters on the GE phenomena that might occur in FBRs. In the numerical simulations, the PLIC type VOF model was employed to calculate these complicated free surface behaviors. The result of numerical simulation under the experimental conditions was compared to the experimental results to evaluate the accuracy of the numerical method. In addition, sensitivities of the suction velocity and the geometric configuration around the suction mouth on the GE behaviors were investigated. As a result, the numerical simulation showed good agreement with experimental data. In addition, two types of the GE were observed in this simulation result. The geometric configuration around the suction mouth also affected the GE behavior. These simulation results implied that the numerical simulation has enough potential to be used for the GE investigation.

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