Traveling instabilities on a crossflow instability dominant boundary layer

Yasuhiro Egami, Yasuaki Kohama

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Full turbulent transition is created in three-dimensional (3D) boundary layer on a swept back flat plate with a displacement body system in a wind tunnel. In the case of general crossflow dominant 3D boundary layer transitions, it is known that after crossflow vortices appeared, crossflow-traveling instability appears. However, it is not clear how the crossflow traveling instability starts to appear and what is the roll of it in the transition process. The flow field is measured in detail using hot-wire anemometry and the smoke visualization technique. Visualization of the crossflow traveling instability f1 is succeeded using high-speed camera. Periodical rolling up vortex motion generated propagating wave with the frequency of f 1. From the results, it can be concluded that crossflow traveling instability f1 is the inflectional point instability existing in spanwise velocity profile. Such unstable condition is originally generated by the streamwise vortex motion.

    Original languageEnglish
    Pages (from-to)327-333
    Number of pages7
    JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
    Volume64
    Issue number618
    DOIs
    Publication statusPublished - 1998 Feb

    Keywords

    • Crossflow instability
    • Crossflow traveling instability
    • Three-dimensional boundary layer
    • Turbulent transition mechanism
    • Visualization technique

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanical Engineering

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