Experimental Study for the Active Flutter Suppression of the Bluff Body

钝体主动抑制颤振的实验研究

• 批准号: 60550326
• 负责人: MIZOTA.TAKETO
• 金额: $ 1.28万
• 依托单位: FUKUOKA INSTITUTE OF TECHNOLOGY (1986-1987)Kyushu University (1985)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550326/
• 关键词: Bluff body; Active Flutter Suppresion; Vortex Excitation; Low Speed Excitatio; Sepalated flow; Shear Layer Instability; Rectangular Prism; フラッタ抑制; 渦励振; 低風速励振; 前縁剥離渦励振; 風洞

When a bluff body oscillates transversely in a uniform flow under the phenomenon of aeroelastic instability,this prism gives two main disturbances into the surrounding flow.First disturbance is given to the vortex sheets beginning at leading edges by the oscillation of the separation points. Secound disturbance is to the separated flow itself of the near wake around after body just behind the separation points.It is very interesting to consider that which is the main effect to bluff body flutter such as a vortex excitation or a low speed excitation of rectangular prisms.If we can understand these disturbance effects on bluff body flutter or characteristic aerdynamic phenomena of rectangular prisms.the method of active flutter suppression will be able to adopt for a vortex excitation or a low speed one.Attention is focused on the first disturbance to the vortex sheet shedding from separation points at the leading edges.In this study,two flaps which oscillate in pitching mode are attached at these leading edges of rectangular prism.The time-mean surface pressures were measured under various reduced velocity of flpa oscillation.In this stage,we can report that there are some essential effects of flap oscillations on the surface pressures.

当一个虚张声势的体在气体弹性不稳定性的现象下以均匀流动的横向振荡时，这种棱镜给周围流动带来了两个主要干扰。首先，通过分离点的振荡，对涡流片的涡流片开始。分隔的干扰是分离的流动本身在分离点后面的近后尾流的分离流动本身。考虑到这是虚张声势颤动的主要效果，例如涡流激发或矩形棱镜的低速激发。在这项研究中，从倾斜模式下振荡的两个襟翼附着在矩形棱镜的这些领先边缘附着两个振荡的皮瓣。时间均值的表面压力在flpa振荡的各种速度下测量。阶段，我们可以报告，瓣振荡对表面压力有一些基本影响。

项目成果

溝田武人: 風工学シンポジウム論文集. 第9回. 319-324 (1986)

Taketo Mizota：风工程研讨会论文集，第 9 期（1986 年）。

溝田武人: 福岡工業大学エレクトロニクス研究所所報. 第3巻. 45-52 (1986)

Taketo Mizota：福冈工业大学电子研究所通报，第 3 卷。45-52 (1986)。

岡島厚: 日本機械学会論文集. 第52巻,480号B編. 2844-2850 (1986)

Atsushi Okajima：日本机械工程师学会会议录，第 52 卷，第 480 期，B 版（1986 年）。

溝田武人: 日本風工学会誌. 第29号. 77-78 (1986)

Taketo Mizota：日本风工程学会杂志，第 29. 77-78 (1986)。

溝田武人,岡島厚: J.Fluid Mechanics.

沟田武人、冈岛敦：《流体力学》。