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.
|Number of pages||8|
|Journal||Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B|
|Publication status||Published - 1986 Dec|
ASJC Scopus subject areas
- Mechanical Engineering