Differences between the motion of a helical vortex and the movement of fluid particles along its axis

V.L. Okulov*, E.S. Gesheva, P.A. Kuibin, S.I. Shtork, J. Sørensen, D. Wood, S.V. Alekseenko

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The motion of a helical vortex and the movement of the fluid particles along its axis are analyzed. The same form of the helical axis of the vortex and the trajectory of the particles sometimes leads to a false assumption of equality of these two different motions. The correct identification of both motions, however, is essential when considering the helical vortices in the wakes of rotors, or the displacement of the core of helicoidal tornado, etc. Only the same helical shape is the vortex axis and the streamline of the fluid particles can mistakenly merge these two different mo19 tions as the identical travel. We describe an experiment that clearly separates these two motions for the case of a stationary helical vortex, along the axis of which the fluid particles intensively move. The result shows that the absolute velocity of fluid particles does not coincide with the motion of the helical vortex as a whole.
Original languageEnglish
JournalThermophysics and Aeromechanics
Volume27
Issue number4
Pages (from-to)473-480
Number of pages8
ISSN0869-8643
DOIs
Publication statusPublished - 2020

Keywords

  • Vortex dynamics
  • Helical vortex

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