波长诱导的脱落频率调节的海胡须启发的圆柱体
Trevor K Dunt1, Kirby S Heck2, Kathleen Lyons1
1Department of Nuclear Engineering and Engineering Physics, University of Wisconsin-Madison, Madison, WI, United States of America.
Bioinspiration & biomimetics
|February 20, 2024
概括
以海胡子为灵感的波浪型气通过改变流的流动频率来减少流体力. 特定的波长最大限度地降低了振荡起重力,为被动流量控制和振动减少提供了洞察力.
科学领域:
- 流体动力学 流体动力学
- 生物启发工程 生物启发工程
- 空气动力学 航空动力学
背景情况:
- 以海胡须为灵感的跨度波动的圆柱体几何学,修改了流流失,并减少了与光滑圆柱相比的流体力.
- 之前的研究已经确定了几何变化,特别是波浪波长,是减力特性的关键.
研究的目的:
- 隔离和分析波浪波长对流体力和流的波长的影响.
- 扩大先前的研究,特别关注波长变化在胡须灵感的几何学.
主要方法:
- 计算模拟了五个以胡须为灵感的模型,在雷诺兹数250的不同波长的雷诺兹数250.
- 与平滑的圆圆柱体相比,具有相等的面积比.
主要成果:
- 在临界非维数值以上,波浪波长会减少的散射幅度和频率,导致振荡升力较低.
- 波长依赖的旋结构会产生独特的散射模式,从而降低振荡升力,尤其是在自然的波长下.
- 复杂的,跨度依赖的提升频谱在波长上出现,产生最大的减力.
结论:
- 了解波浪波长和频谱之间的关系对于有效的被动流量控制至关重要.
- 这种几何形状显示了振动调整和减少引发的振动 (VIV) 的前景.
相关概念视频
01:28Standing Waves in a Cavity
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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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