尖端的作用在控制猫头翅膀上的流量
Tanner Saussaman1, Asif Nafi1, David Charland2
1Physics and Engineering Science, Coastal Carolina University, Conway, SC, United States of America.
Bioinspiration & biomimetics
|August 31, 2023
概括
猫头翅膀上的尖端纹在不同角度改变空气流量. 这些被动流量控制装置可以在低角度放大流,但在更高角度抑制它,潜在地减少噪音.
科学领域:
- 流体动力学 流体动力学
- 生物启发的工程是生物启发的.
- 空气动力学 在空气动力学.
背景情况:
- 猫头拥有隐形飞行能力,这种能力归因于翅膀的微型特征,如前沿的纹.
- 螺纹是被动的流量控制装置,可以增强飞行特征,如空气声学和空气动力学.
研究的目的:
- 为了研究前沿纹对猫头翅膀模型流动动学的影响.
- 为了比较边界层在各种攻击角度上的变化,比较有和无翼模型.
主要方法:
- 使用粒子图像速度计 (PIV) 的实验研究.
- 在边界层内测量平均和流特征.
- 分析不同攻击角度的流动模式.
主要成果:
- 领先的尖端纹修改了所有攻击角度的边界层.
- 在低于20°的角度下,纹会放大流,但不会显著改变平均流量.
- 在20°的攻击角度,纹通过促进更早的流量分离和重新连接来抑制流,减少噪音.
结论:
- 最先进的纹作为有效的被动流量控制装置.
- 纹对流动动学的影响取决于角度,为降低噪声和增强空气动力学提供了潜力.
- 这项研究为改善飞行性能提供了对生物灵感空气动力学设计的见解.
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