了解低速条纹及其功能,并通过移动鱼作为被动分离控制机制的移动鱼进行控制
Leonardo M Santos1, Amy Lang1, Redha Wahidi1
1Department of Aerospace Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA.
Biomimetics (Basel, Switzerland)
|July 26, 2024
概括
鱼的皮通过响应逆流而发毛来被动控制空气流动. 这种机制减少了流边界层中的流量分离,提高了空气动力学效率.
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.
- 生物模拟学是一种生物模拟学.
背景情况:
- 动荡的边界层在不利的压力梯度下容易发生流动分离.
- 短马科鱼的被动毛被假设是为了减轻流量分离.
- 了解这种机制可以为新的流量控制策略提供信息.
研究的目的:
- 量化在分隔流边界层的低速条纹内的反向流量.
- 为了阐明可移动鱼皮的被动流量控制机制.
- 为了研究鱼皮肤如何影响流量分离与光滑表面相比.
主要方法:
- 采用数字粒子图像速度计 (DPIV) 来分析流动力学.
- 实验是在光滑的平板和带有鱼皮样本的板上进行的.
- 在不利的压力梯度条件下研究了流量特性.
主要成果:
- 在鱼皮肤上的流量类似于零压梯度边界层,与光滑板块不同.
- 鱼皮导致跨度间距减少,低速条纹数量增加.
- 在鱼皮肤上的反向条纹更薄,速度有利于状毛发.
结论:
- 鱼皮肤的被动毛机制有效地抑制了低速条纹的反向流动.
- 鱼皮的独特结构改变了流边界层的特征,以防止流量分离.
- 这项研究为空气动力学应用的生物启发的被动流量控制提供了洞察力.
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