10509 噴流内部流動と周囲流動構造のPIV計測(産学における混相研究(3),OS.13 産学における混相研究)

概要

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For the safety design of the Fast Breeder Reactor (FBR), it is strongly required that the Post Accident Heat Removal (PAHR) is achieved after a hypothetical Core Disruptive Accident (CDA). In the PAHR, it is important that the molten core material is broken up and fragmented to be solidified by the sodium coolant. To estimate breakup behavior and fragmentation behavior of molten material in coolant, it is necessary to clarify internal flow of jet and surrounding flow structure. In the present study, experiments are conducted to clarify mechanism of internal and external flow of jet during fragmentation behavior. Internal and external velocity distribution of jet during fragmentation behavior is obtained by Particle Image Velocimetry (PIV) technique. Shear stress, Reynolds stress and turbulent kinetic energy are evaluated from the velocity data obtained by the PIV technique. As the results, shear stress becomes large along interfacial wave. Reynolds stress becomes large toward downstream. It is suggested that the local shear stress on the jet surface causes the fragmentation. From experimental results, effect of internal and external flow of jet on the fragmentation behavior is discussed.
社団法人日本機械学会の論文
2009-03-05