G0501-4-1 曲がり管内乱流に及ぼすWingletの効果(管内流れ)

概要

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The flow through the curved pipe has been studied considerably, because of its practiced importance in mechanical engineering. This flow changes into the complex three-dimensioned flow which is formed the secondary flow by centrifuged force. The secondary flow is convenient for mixing fluid and promoting heat transfer, on the other hand it brings about the increase in the flow resistance. Therefore, it is necessary to investigate the relationship between fluid flow and the flow residence, for aiming to improve the performance of fluid instrument. In the present experiment, we introduced the Winglet in order to restrain the secondary flow in the curved pipe, and investigated the effect of the Winglet on the turbulent flow in the curved pipe. The experienced data showed that the asymmetry Winglet lead the decrease about 5 percents in the flow residence, because the secondary flow changed into the flow similar to the swirling flow and the bias of the mainstream disappeared. In conclusion, it was clear that the turbulent energy and wall shear stress are restrained.
一般社団法人日本機械学会の論文
2009-09-12