BOUNDARY-LAYER TRANSITION ON ROTATING CONES IN AXIAL FLOW WITH FREE-STREAM TURBULENCE.

Ryoji Kobayashi, Yasuaki Kohama, Takakage Arai, Motoyuki Ukaku

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    This paper is concerned with the laminar-turbulent transition of three-dimensional boundary layers on cones rotating in external axial flow. The experiment was carried out for three cone angles of 15 degree , 30 degree and 60 degree in a range of free-stream turbulence (0004% to 3. 5%) using a hot-wire anemometer and a flow-visualization technique. The transition region was determined with the critical Reynolds number and the transition Reynolds number in relation rotational speed ratio. The spiral vortices were found to fix relative to the rotating surface. The relation of the direction of the spiral vortices to the rotational speed ratio remains unchanged as the cone angle becomes larger, while the number of vortices increases with increased cone angle. These experimental results were compared with the present numerical results based on the linear stability theory. The free-stream turbulence has no effect on the transition Reynolds number, while the effect becomes more sensitive to the critical Renolds number as the cone angle is increased.

    Original languageEnglish
    Pages (from-to)423-429
    Number of pages7
    JournalJSME International Journal
    Volume30
    Issue number261
    DOIs
    Publication statusPublished - 1987 Jan 1

    ASJC Scopus subject areas

    • Engineering(all)

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