イワツ レイマ   IWATSU Reima
  岩津 玲磨
   所属   東京電機大学  工学部 機械工学科
   東京電機大学大学院  先端科学技術研究科 機械システム工学専攻
   東京電機大学大学院  工学研究科 機械工学専攻
   職種   教授
言語種別 英語
発行・発表の年月 2019
形態種別 国際会議論文
査読 査読有り
標題 Unsteady vortex breakdown phenomena in an enclosed cylindrical container with a rotating disk
執筆形態 共著
掲載誌名 Proc. ASME-JSME-KSME 2019 Joint Fluids Engineering Conference
掲載区分国外
出版社・発行元 ASME
巻・号・頁 AJK2019-4751
総ページ数 10
著者・共著者 Yuki NAKATSUKA, Reima IWATSU, Jae Min Hyun, Hide S. KOYAMA
概要 A high-quality precision-controlled turntable apparatus was fabricated to probe the dynamic behavior of a viscous fluid contained in a cylindrical container. Vortex breakdown(s) produced by a rotating endwall disk was visualized by using a fluorescent dye injection technique, and its flow field was measured by using a particle image velocimetry. Limiting boundaries for single, double and triple vortex breakdowns in steady flow were re-plotted to compare with the previous visualization studies of Escudier. The locations of stagnation points of the vortex breakdown bubble(s) in steady flow were measured quantitatively. In unsteady flow, the amplitude and time period of periodic axial oscillation, and the polar angle and time period of precession, were measured. The domains for periodic axial oscillation and for precession in unsteady flow were delineated.