OS8-5 蒸気インジェクタ内の噴流熱流動機構に関する研究(OS8 軽水炉・新型炉・核燃料サイクル,循環型社会における動力エネルギー技術)

概要

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Characteristics of a steam injector and steam condensation phenomena on water jet surface in the steam injector were experimentally examined. Analyses by using the STAR-CD code were also performed for the steam injector. The steam injector used in the present experiments could elevate pressure five times higher than inlet pressure. In visual experiments of behavior of the water jet in the steam injector, many large waves were observed on the water jet surface. The waves showed the tendency to grow as those proceeded downstream. The Kelvin-Helmholtz instability theory predicted the disruption of the water jet in the steam injector conservatively. Direct steam condensation on to the water jet surface in the steam injector was mainly controlled by radial heat transport in the water jet. The radial heat transport in the water jet was considerably more effective than that in the usual turbulent heat transport in a pipe. It was pointed out that this highly effective radial heat transport mechanism was created by local circulation in the water jet that was produced by waves on the water jet surface.
社団法人日本機械学会の論文
2007-06-13