Structure Analysis and Control of Necklace Vortices Generated between Two Circular Cylinders Forming a Separating Cross

形成分离十字的两个圆柱体之间产生的项链涡流的结构分析与控制

• 批准号: 14550168
• 负责人: YAMADA Hidemi
• 金额: $ 1.79万
• 依托单位: Tokuyama College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550168/
• 关键词: Fluids Dynamics; Crossed Two Circular cylinders; Gap Distance; Vortices Structure; Necklace Vortex; Three Dimensional Wake; Flow Visualization; Surface Pressure Distribution; 直交配置2円柱; 首飾渦; 可視化実験; PIV計測

The three dimensional flow field area and the necklace vortices structure around two cylinders forming a separating cross were visualized using a dye injection method and a tracer particle method under the Reynolds number between 500 and 2000, and the surface pressure distribution on two circular cylinders was measured under the Reynolds number between 1000 and 8000 in detail to clarify the necklace vortex structures in uniform flow and the effects of the necklace vortex behavior on the fluid force into and on the separation flow from the cylinders. In addition, the relationship between the necklace vortex structure being made change by the gap distance and the pressure distribution on the surface of the cylinders was investigated.It is found that the various patterns of the necklace vortices system are produced, depending on the gap distance "G" between two cylinders. In the case of the gap distance ratio "G/d" between 0 and 0.1, the boundary layer on the surface of the upstream cylinder separates and rolls up as a small necklace vortex in the front of the downstream cylinder, and the vortex system with 4 vortices is produced in the symmetrical plane of y/d=0. In the case of G/d=0.2-1.0, a pair of main necklace vortices grows in the gap space between two cylinders, and the 8 vortices system as total is produced. In the case of G/d=1.0-1.5, the pair of main necklace vortices starts vibrating as well as twin vortices behind a cylinder in the low Reynolds number. In the case of G/d=1.5-2.0, the behavior of necklace vortices behind the upstream cylinder is similar to that of Karman vortices under the low Reynolds number.

在雷诺数500~2000范围内，利用染料注射法和示踪粒子法对形成分离十字的两个圆柱体周围的三维流场区域和项链涡流结构进行可视化，并测量了两个圆柱体上的表面压力分布。在 1000 至 8000 之间的雷诺数下详细阐明均匀流动中的项链涡结构以及项链涡行为对流体力流入和流出的影响来自气缸的分离流。此外，还研究了间隙距离改变的项链涡结构与圆柱体表面压力分布之间的关系。发现，根据间隙距离，会产生各种模式的项链涡系统。两个气缸之间的“G”。当间隙距离比“G/d”在0～0.1之间时，上游圆柱体表面的边界层分离并在下游圆柱体前端卷起成小项链涡，涡系统具有在y/d=0的对称平面内产生4个涡旋。当G/d=0.2-1.0时，两个圆柱体之间的间隙空间中生长出一对主链涡，总共产生8个涡系统。当G/d=1.0-1.5时，一对主链涡开始振动，低雷诺数圆柱体后面的双涡开始振动。在G/d=1.5-2.0的情况下，上游圆柱体后面的项链涡的行为类似于低雷诺数下的卡门涡。

项目成果

直交配置2円柱における首飾渦挙動と表面近傍流れ

两个正交排列圆柱体中的颈线涡行为和近地表流动

• 发表时间: 2005
• 期刊: 日本機械学会大分地方講演会講演論文集 No.058-2
• 作者: 山田英巳

直交配置された異径2円柱の間隙内に形成する首飾渦の可視化

正交排列的两个不同直径圆柱体之间间隙中形成的项链涡流的可视化

• 发表时间: 2004
• 期刊: 可視化情報 24・Suppl.1
• 作者: 山田英巳;Hidemi YAMADA;山田英巳;Hidemi YAMADA;山田英巳
• 通讯作者: 山田英巳

十字形配置2円柱の間隙部に生成する首飾渦の可視化(渦系パターンの変化とPIV計測)

十字形排列的两个圆柱体之间的间隙中产生的项链涡流的可视化（涡流系统模式和 PIV 测量的变化）

• 发表时间: 2003
• 期刊: 日本機械学会鹿児島地方講演会講演文集 No.038-2
• 作者: 山田英巳;竹村大輔
• 通讯作者: 竹村大輔

直交配置された異径2円柱の間隙部に形成する首飾渦の可視化

两个正交排列的不同直径圆柱体之间的间隙中形成的项链涡旋的可视化

• 发表时间: 2004
• 期刊: 可視化情報学会第32回可視化情報シンポジウム講演論文集 24-Suppl.1
• 作者: 山田英巳;Hidemi YAMADA;山田英巳
• 通讯作者: 山田英巳

山田英巳, 竹村大輔: "十字形配置2円柱の間隙部に生成する首飾渦の可視化(渦系パターンの変化とPIV計測)"日本機械学会講演論文集. No.038-2. 111-112 (2003)

Hidemi Yamada、Daisuke Takemura：“在十字形排列的两个圆柱体之间的间隙中产生的项链涡流的可视化（涡流系统模式和 PIV 测量的变化）”日本机械工程师学会会议录第 038-2 号。 111-112（2003）