Vortex Breakdown Phenomena in a Circular Pipe (5th Report, Axisymmetric Breakdown in Rotating Conical Pipes)

Yoshikazu Suematsu, Tadaya Ito, Toshiyuki Hayase

研究成果: Article査読

抄録

It is known that a swirling flow in a diverging pipe breaks down more easily than a flow in a converging one. In this report, experiments are made using diverging, converging and straight pipes, in order to clarify the relation between the shape of pipes and the occurrence of the breakdown. Swirling flow fields, that are realized by rotation of pipes, are measured by a Laser-Doppler-Velocimeter. When each pipe rotates faster than a certain critical value, a stationary internal wave occurs. The vortex breakdown phenomenon is due to the internal waves in swirling flows, as pointed out in preceding reports. In the diverging pipe, the amplitude of the wave is rather smaller than that in the converging pipe; but the mean axial flow near the axis is fairly retarded, so that the flow reverses at the trough of the superposed wave component, and bubble type breakdown appears. A mathematical model is also presented to give a qualitative explanation of the effect of a sectional area variation.

本文言語English
ページ(範囲)1626-1635
ページ数10
ジャーナルTransactions of the Japan Society of Mechanical Engineers Series B
52
476
DOI
出版ステータスPublished - 1986
外部発表はい

ASJC Scopus subject areas

  • 凝縮系物理学
  • 機械工学

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