Effect of trailing-edge bevel on the aeroacoustics of a flat-plate
Effect of trailing-edge bevel on the aeroacoustics of a flat-plate
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后缘斜角对平板气动声学的影响
DOI：
10.1063/5.0024248
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发表时间：
2020
影响因子：
4.6
通讯作者：
M. Azarpeyvand
中科院分区：
文献类型：
--
作者：
A. Celik;J. Bowen;M. Azarpeyvand
通过实验研究了斜角对尾缘辐射噪声及相关流场的影响。尾缘的斜角在很大的角度范围内进行调整，以展示附着和分离边界层的气动声学特性。从波束形成阵列获得的远场噪声结果与相关的流场一起进行了评估。远场测量结果表明，与没有斜角的基准平板情况相比，在一定斜角范围内，流保持附着的辐射噪声水平增加。近场测量给出了压力系数、非定常表面压力结果、边界层湍流特性以及这些量的相应谱特性。近场测量结果表明，引入斜角会在平板和斜角上形成一个有利的压力梯度区域，从而加速流动，减小边界层结构的尺寸，直到斜角中部区域，然后向尾缘减速。这种变化增加了表面压力波动的能量含量以及尾缘和尾迹上速度场的能量含量，这反过来又导致波束形成结果支持的辐射远场噪声增加。此外，在足够高的斜角下，发生明显的流动分离，尾缘和剪切层之间缺乏相互作用，导致辐射远场噪声与基线平板相比显着降低。
An experimental study was conducted to investigate the effect of the bevel angle on the radiated noise and the associated flow-field over the trailing-edge. The bevel angle of the trailing-edge was adjusted over a broad range of angles to demonstrate the aeroacoustic properties of the attached and separated boundary layers. The far-field noise results obtained from the beamforming array were assessed in conjunction with the associated flow-field. Far-field measurement results show an increased level of radiated noise for a range of bevel angles where the flow remains attached compared to the baseline flat-plate case without a bevel angle. Near-field measurements are presented in terms of pressure coefficients, unsteady surface pressure results, turbulence properties of the boundary layer, and corresponding spectral properties of these quantities. The near-field measurement results indicate that introducing a bevel angle yields a region of favorable pressure gradient on the flat-plate and bevel, which accelerates the flow and reduces the size of structures in the boundary layer up until the mid-bevel region, which then decelerates toward the trailing-edge. This change increases the energy content of surface pressure fluctuations as well as the energy content of the velocity field over the trailing-edge and wake, which, in turn, results in an increased radiated far-field noise as supported by beamforming results. Furthermore, at a sufficiently high bevel angle, where pronounced flow separation occurs, the lack of interaction between trailing-edge and shear layer leads to a significant reduction in the radiated far-field noise compared to that of the baseline flat-plate.
影响因子：
4.7
作者：
Chaitanya P
通讯作者：
Chaitanya P
影响因子：
3.7
作者：
L. E. Jones;R. Sandberg
通讯作者：
L. E. Jones;R. Sandberg