Nature-Inspired Porous Airfoils for Sound Reduction
Nature-Inspired Porous Airfoils for Sound Reduction
复制标题
受自然启发的多孔翼型可降低噪音
DOI：
10.1007/978-3-642-28302-4_21
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发表时间：
2012
期刊：
影响因子：
0.8
通讯作者：
C. Fritzsche
中科院分区：
文献类型：
--
作者：
T. Geyer;E. Sarradj;C. Fritzsche
受飞行猫头鹰和准备猫头鹰翅膀的声学测量结果的启发，支持猫头鹰无声飞行的论文，在航空声学风洞中对由开孔、可渗透材料制成的技术翼型进行了测量，其特征在于其气流阻力。这些实验的一个主要目标是识别能够减少航空声学噪声的多孔材料。利用麦克风阵列技术和三维解卷积波束形成算法，研究了后沿噪声和前沿噪声的产生。通过使用具有中到高气流速度系数的翼型，可以实现每单位升力的最高后缘噪声降低，而对于具有低气流速度系数的翼型，测量到最高前缘噪声降低。
Inspired by the results from acoustic measurements on flying owls and prepared owl wings that support the thesis of the silent flight of owls, measurements were conducted on technical airfoils made from open-porous, flow-permeable materials, characterized by their air flow resistivity, in an aeroacoustic wind tunnel. One major objective of these experiments is the identification of porous materials that enable a reduction of aeroacoustic noise. Both the generation of trailing edge noise and the generation of leading edge noise were investigated using microphone array technology and three-dimensional deconvolution beamforming algorithms. The highest trailing edge noise reduction per unit lift force can be achieved by using airfoils with medium to high air flow resistivities, while the highest leading edge noise reduction was measured for airfoils with low air flow resistivities.