| 褶皱幅度对仿生翼型滑翔气动特性的影响 |
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| 引用本文： | 张子龙,殷雅俊,仲政,赵红晓. 褶皱幅度对仿生翼型滑翔气动特性的影响[J]. 力学季刊, 2018, 39(1): 22. DOI: 10.15959/j.cnki.0254-0053.2018.01.002 |
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| 作者姓名： | 张子龙 殷雅俊 仲政 赵红晓 |
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| 作者单位： | 同济大学航空航天与力学学院;清华大学航天航空学院 |
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| 摘 要： | 蜻蜓翅膀具有独特的褶皱状形貌．研究者们致力于利用仿生学原理，设计在低雷诺数条件下具有更优气动性能的褶皱翼型．本文采用计算流体力学方法，求解二维不可压Navier-Stokes方程组，探讨了四种翼型（平板翼型、流线翼型、小幅度褶皱翼型和大幅度褶皱翼型）的气动表现．在低雷诺数条件下得到以下结果：(1) 较小幅度的褶皱结构有利于增加升力和减小阻力．(2) 雷诺数变化时褶皱翼型的升力系数呈非线性变化；在特定雷诺数区间，幅度相近的褶皱翼型会发生相对气动优势的转变．(3) 褶皱结构内的回流区通过减小粘性阻力，使得翼型总阻力下降．(4) 翼型前缘的极小区域会产生脉冲高升力，对升力表现产生较大影响．这些结果表明，调整褶皱幅度是实现褶皱翼型气动优化的有效方案．
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| 关 键 词： | 蜻蜓翅膀 褶皱翼型 幅度 低雷诺数 计算流体力学 |
The Aerodynamic Effects of Corrugation Amplitudes of Bionic Airfoils in Gliding Flight |
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| ZHANG Zilong,YIN Yajun,ZHONG Zheng,ZHAO Hongxiao. The Aerodynamic Effects of Corrugation Amplitudes of Bionic Airfoils in Gliding Flight[J]. Chinese Quarterly Mechanics, 2018, 39(1): 22. DOI: 10.15959/j.cnki.0254-0053.2018.01.002 |
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| Authors: | ZHANG Zilong YIN Yajun ZHONG Zheng ZHAO Hongxiao |
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| Abstract: | Dragonfly wings possess unique morphologies with corrugations. Utilizing the bionic principle, researchers were working on creating corrugated airfoils with better aerodynamic performance in low Reynolds numbers. In this paper, aerodynamic performances of four airfoils (flat airfoil, streamline airfoil, corrugated airfoils with lower amplitudes and corrugated airfoils with higher amplitudes) were calculated by solving the 2-D incompressible Navier-Stokes equations with the CFD method. Then we got results in conditions of low Reynolds numbers as follows: (1) the corrugations with lower amplitudes could increase the lift and decrease the drag. (2) The lift of corrugated airfoil changed nonlinearly when the Reynolds number varied. (3) The drag reduction was due to recirculation zones within corrugations as they decreased the viscous drags. (4) The lift was under a significant influence of pulsing high-lift generated at the leading edge of the airfoils. These results demonstrated that the adjustment of corrugation amplitude would be an effective method to achieve the aerodynamic optimization of corrugated airfoils. |
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| Keywords: | dragonfly wing corrugated airfoil amplitude low Reynolds numbers computational fluid mechanics |
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