3-Dimensional Structure of Eddy in Free Turbulence Flow

自由湍流中涡流的三维结构

• 批准号: 61550710
• 负责人: YUU Shinichi
• 金额: $ 1.02万
• 依托单位: Kyushu Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550710/
• 关键词: Developing Turbulence; Large Scale Vortices; Free Jet; Velocity Vector Diagram; 2点間速度相関; 自由乱流; 乱流の遷移; 渦の合一; 大規模流れの干渉

A series of measurements was made simultaneously by using arrays of hot-wire anemometers with X-probes. The data show the rows consisted of doughnut-type large-scale vortices and their frequent pairing which results in larger vortices. The interaction of these vortices beyond the jet centrline breaks the doughnut-type large-scale vortices and forms three-dimensional medium and small-sized vortices. The flow is randomized through this process. Some large scale vortices continue to pair and form the configuration of counter-rotating vortices approximately alternating on opposite sides of the jet centerline in the region far from the nozzle.

一系列的测量同时进行，通过使用阵列的热线风速计与X-探头。数据表明，行组成的甜甜圈型大尺度涡和它们的频繁配对，从而导致更大的涡。射流中心线以外的涡的相互作用打破了环形大涡，形成了三维中小涡。通过该过程，流是随机的。在远离喷嘴的区域中，一些大尺度涡流继续成对并形成在射流中心线的相对侧上近似交替的反向旋转涡流的配置。

项目成果

Shinichi Yuu: "Developing Process of Turbulence in a Round Nozzle Air Jet" 54. (1988)

Shinichi Yuu：“圆形喷嘴空气射流中湍流的发展过程”54。（1988）

湯晋一: 日本機機学会論文集B編. 54. (1988)

Shinichi Yu：日本机械工程师学会会议记录，卷 B. 54。（1988 年）

Shinichi Yuu;Akinori Toyoda: Physics of Fluids. 31. (1988)

Shinichi Yuu；Akinori Toyoda：流体物理学。