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arXiv 2107.07563physics.flu-dyn
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寻轨控制在翼型后缘噪声抑制中的应用

Extremum seeking control applied to airfoil trailing-edge noise suppression

Tarcísio Costa Déda Oliveira, William Roberto Wolf

摘要:

在NACA 0012翼型的高逼真度流场仿真框架中应用了振幅寻迹控制(ESC)及其斜率寻迹推广,以降低翼型产生的噪声。两个雷诺数进行了研究,不同的噪声产生机制被激发。对于低雷诺数流动,翼型后缘处的旋涡脱落的散射产生音调噪声,而对于中等雷诺数情况,边界层不稳定性在后缘处散射,导致在宽带驼峰上叠加的多个音调的噪声发射。研究了不同的控制设置,并且它们被配置为找到用于吹/吸装置的最佳稳定致动器强度或最佳位置。实现细节进行了讨论,关于控制模块和数字滤波器的设计。

英文摘要:

Extremum seeking control (ESC) and its slope seeking generalization are applied in a high-fidelity flow simulation framework for reduction of acoustic noise generated by a NACA0012 airfoil. Two Reynolds numbers are studied for which different noise generation mechanisms are excited. For a low Reynolds number flow, the scattering of vortex shedding at the airfoil trailing edge produces tonal noise while, for a moderate Reynolds number case, boundary layer instabilities scatter at the trailing edge leading to noise emission at multiple tones superimposed on a broadband hump. Different control setups are investigated and they are configured to either find an optimal steady actuator intensity or an optimal position for a blowing/suction device. Implementation details are discussed regarding the control modules and design of digital filters.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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