Control of turbulent transition using fiber surface in flat plate boundary layer

Emi Oguri, Yasuaki Kohama

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    Abstract

    Present paper deals with control of turbulent transition in flat plate boundary layer developed on a fiber surface for the purpose of drag reduction. The previous measurement showed 9% drag reduction as compared with a smooth surface case in lower Reynolds number range because turbulent transition was delayed. Intensive investigation including the streamwise velocity and the spatial correlation measurements was performed in order to reveal transition process and mechanism of the transition delay with the fiber surface, using the trip wire or a turbulance grid'to generate initial disturbances. Hot-wire measurements showed that the fiber surface delays transition in both trip wire and turbulence grid cases. The delay in trip wire case is much later than in the turbulence grid case. The growth of the streamwise velocity fluctuation introduced by the trip wire is dumped by the fiber surface though it does not change in the turbulence grid case. The spatial correlation measurement suggested that there exists streak structures in the transitional boundary layer and that they are suppressed by the fiber surface.

    Original languageEnglish
    Pages (from-to)2942-2949
    Number of pages8
    JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
    Volume64
    Issue number625
    DOIs
    Publication statusPublished - 1998

    Keywords

    • Boundary layer
    • Fiber surface
    • Flow control
    • Free stream turbulence
    • Transition
    • Trip wire

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanical Engineering

    Fingerprint Dive into the research topics of 'Control of turbulent transition using fiber surface in flat plate boundary layer'. Together they form a unique fingerprint.

    Cite this