B201 冷減速材開発のための流動実験及び解析

抄録

The Japan Atomic Energy Research Institute is developing a MW-scale spallation target system under the Neutron Science Project. A cold moderator using supercritical hydrogen is one of the key components in the target system, which directly affects the neutronic performance both in intensity and resolution. Since a hydrogen temperature rise in the moderator vessel affects the neutronic performance, it is necessary to ensure the smooth flow of hydrogen while suppressing the recirculation and stagnant flows which cause hot spots. In order to learn the flow pattern of the impinging jet flow and the flow induced by the jet, the experiments using the acrylic model simulating the moderator vessel, were carried out under water flow conditions with a PIV system. In parallel with the experiments, the hydraulic analyses were carried out with the STAR-CD. Both the experimental and analytical results showed the recirculation flow clearly. And the analytical results agreed well with the experimental results.