...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Fluids and Structures >Experimental and numerical investigations of the torsional flutter oscillations of a 4:1 rectangular cylinder
【24h】

Experimental and numerical investigations of the torsional flutter oscillations of a 4:1 rectangular cylinder

机译：4：1矩形圆柱扭转扭振的实验和数值研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The torsional flutter oscillations of a 4:1 rectangular cylinder around its pitching axis are investigated through wind tunnel experiments and numerical simulations. The rectangle's responses to different initial conditions and turbulence excitations at various wind tunnel airspeeds are recorded. Time-resolved Particle Image Velocimetry measurements are taken at two different airspeeds, when the rectangle undergoes Limit Cycle Oscillations. Aeroelastic simulations are carried out using the Discrete Vortex Method and the resulting responses are compared to the experimental measurements. The Common-base Proper Orthogonal Decomposition method is used to analyze and compare the measured and simulated unsteady flow fields around the rectangle. A discussion of the participation of each mode in the different states of the flow-field is presented at two different amplitudes of oscillation. The Motion Induced Vortex (MIV) is identified as the fundamental cause of the torsional flutter phenomenon and its role over a complete cycle is studied. MIV-induced oscillations can be started either by a suitable initial disturbance or by a second, nearly linear self-excited instability that causes negative aerodynamic damping. The combination of these two instabilities results in a complete description of the torsional flutter of the rectangle.
机译：通过风洞实验和数值模拟研究了4：1矩形圆柱体绕其俯仰轴的扭转颤振振荡。记录了矩形在各种风洞空速下对不同初始条件和湍流激发的响应。当矩形经历极限循环振荡时，在两种不同的空速下进行时间分辨的粒子图像测速测量。使用离散涡旋方法进行了气动弹性模拟，并将所得响应与实验测量值进行了比较。共基固有正交分解方法用于分析和比较矩形周围测量和模拟的非稳态流场。在两种不同的振幅下，讨论了每种模式在流场不同状态下的参与。运动诱发涡流（MIV）被确定为扭转颤动现象的根本原因，并研究了其在整个周期中的作用。 MIV引起的振荡可以由适当的初始扰动或由导致负空气动力学阻尼的第二种近似线性的自激不稳定性引起。这两个不稳定性的结合导致对矩形扭转颤动的完整描述。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号