Suppression and Generation Mechanism of Combinated Vibration Phenomenon of Fluid-Structure of the Plural Circular Structures

多元圆形结构流固性组合振动现象的抑制及产生机制

• 批准号: 12650153
• 负责人: SAKAMOTO Khiroshi
• 金额: $ 2.3万
• 依托单位: Kitami Institute 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: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650153/
• 关键词: Plural Circular Cylinder; Combinated Vibration Phenomenon; Aerodynamic Forces; Vortex Shedding; Passive Control; Tripping Rod; Tandem Arrangement; Side by Side Arrangement; 複数円柱構造体; 空力特性; 渦励振; 空気力の制御; 流力振動の制御; 制御平板

The objective of this study is investigated the suppression of generation mechanism of the combination-vibration phenomenon of fluid-structure of the plural circular structures. Two circular cylinders with the same diameter having a fundamental structure configuration are adopted. At first, the time-averaged fluid forces, the fluctuating fluid forces and vortex shedding frequency of two circular cylinders arranged in various positions are examined in detail. Next, the suppression of the fluid forces and vortex shedding of two circular cylinders is done by the passive control of flow. The passive control is established by two methods. Namely, one is the control of the approaching flow using a small flat plate; other is the control of the boundary layer on the surface using two tripping rods attached to the cylinders. The main results can be summarized as follows(1) The characteristics of the time-averaged fluid forces, fluctuating fluid forces and vortex shedding of two circular cylinde … More rs arranged in various positions are elucidated. In particular, the fluctuating fluid forces, which are generated flow induced vibrations, are related with the form of arrangement of two circular cylinders.(2) The suppression of the fluid forces acting on two circular cylinders in tandem arrangement is done by introducing a fine plate in the upstream of cylinders. As a result, the fluctuating fluid forces and vortex shedding of two circular cylinders, which are generated flow-induced vibrations, are substantially suppressed using a flat plate with a width of one tenth of the cylinder diameter.(3) The suppression of the fluid forces acting on two circular cylinders in side-by-side arrangement is done by two tripping rods attached the surface of those. As a result, the fluctuating fluid forces and vortex shedding of two circular cylinders, which are generated flow-induced vibrations, are substantially suppressed.(4) Flow induced-vibration of two circular cylinders can be sufficiently suppressed by use of the control methods established the present study. Also, the accumulation of the results of the present study can be sufficiently contributed for numerical analysis of the combination vibration of fluid-structure. Less

本研究之目的为探讨复数圆形结构之流固结合振动现象之产生机理。采用具有基本结构构型的两个相同直径的圆柱体。首先，详细研究了两圆柱在不同位置上的时均流体力、脉动流体力和旋涡脱落频率。其次，通过对流动的被动控制，实现了对两个圆柱体的流体力和旋涡脱落的抑制。被动控制是建立两种方法。即一种是用小平板控制来流，另一种是用两个连接在圆柱上的触发杆控制表面边界层。主要研究结果如下：（1）研究了两圆柱绕流的时均流体力、脉动流体力和旋涡脱落的特性 ...更多信息 阐述了布置在各种位置的RS。特别地，由流致振动产生的脉动流体力与两个圆柱的布置形式有关。(2)通过在圆柱上游引入一个细平板来抑制作用在两个串联圆柱上的流体力。结果，使用宽度为圆柱直径十分之一的平板，基本上抑制了两个圆柱的波动流体力和涡流脱落，这些波动流体力和涡流脱落是由流致振动产生的。(3)作用在并排布置的两个圆柱体上的流体力的抑制是通过两个连接在圆柱体表面的脱扣杆来完成的。结果，基本上抑制了两个圆柱体的波动流体力和旋涡脱落，这是由流致振动产生的。(4)本文所建立的控制方法可以有效地抑制双圆柱的流激振动。同时，本文研究成果的积累也为流体-结构组合振动的数值分析提供了充分的理论依据。少

项目成果

H. SAKAMOTO, et al.: "Fluctuating Fluid Forces of Two Circular Cylinders in Tandem Arrangement at Close Spacing"Conference of JSME. No.306. 108-109 (2000)

H. SAKAMOTO 等：“紧密间距串联排列的两个圆柱体的波动流体力”JSME 会议。

坂本弘志, ほか3名: "Fluctuating Fluid Forces Actingon Two Circular Cylinders in a Tandem Arrangement at a Sabcritical Reynolds Number"Proceedings of the 4th Asia-Pacific conference on Wind Engineering. JWE-No.89. 697-700 (2001)

Hiroshi Sakamoto 和其他 3 人：“亚临界雷诺数下串联排列的波动流体力”第四届亚太风工程会议论文集 JWE-No.89 (2001)。

H. SAKAMOTO, et al.: "Fluctuating Fluid Forces of Two Circular Cylinders in Tandem Arrangement at Close Spacing"Trans. of JSME. (in press). (2002)

H. SAKAMOTO 等人：“紧密间距串联排列的两个圆柱体的波动流体力”Trans。

坂本弘志 ほか3名: "Suppression of Fluid Forces Acting on Two Square Prisms in Tandem Arrangement by Passive Control."Proceedings of the 4th International conference on Hydrodynamics, Yokohama, Japan. Vol.1. 477-482 (2000)

Hiroshi Sakamoto 等 3 人：“通过被动控制作用于串联排列的两个方形棱镜的流体力”，第四届国际流体力学会议论文集，日本横滨，第 1 期，477-482。

坂本弘志, ほか3名: "Suppression of Fluid Forces Acting on Two Circlar Cylinders in Tandem Arrangement by Passive Control"Proceedings of the 5th International Conference on Hydrodynamics. (発表予定). (2002)

Hiroshi Sakamoto 等 3 人：“通过被动控制抑制串联排列的两个圆形圆柱体上的流体力”第五届国际流体力学会议论文集（2002 年）。