INSTABILITY AND TRANSITION OF A BOUNDARY LAYER ON A ROTATING CONE (4TH REPORT, CONES OF DIFFERENT TOTAL ANGLES AND EFFECTS OF FREESTREAM TURBULENCE).

Ryoji Kobayashi, Yasuaki Kohama, Takakage Arai, Motoyuki Ukaku

    Research output: Contribution to journalArticlepeer-review

    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 total included cone angles of 15 degree , 30 degree and 60 degree in a range of freestream turbulence (0. 04% to 3. 5%) using a hot-wire anemometer and a flow-visualization technique. The transition region is determined with the critical Reynolds number and the transition Reynolds number in relation to the rotational speed ratio. The spiral vortices are 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 the vortices increases with increased cone angle.

    Original languageEnglish
    Pages (from-to)3912-3919
    Number of pages8
    JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
    Volume52
    Issue number484
    Publication statusPublished - 1986 Dec

    ASJC Scopus subject areas

    • Mechanical Engineering

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