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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