Abstract A study on attenuating the self-induced roll oscillations of low-aspect-ratio flat-plate wings was conducted experimentally in a wind tunnel facility using a bionic flow control approach of the sinusoidal leading-edge (SLE). It was found that the effectiveness of the SLE on roll attenuation strongly depends on its amplitude and wavelength. Velocity measurements indicated that the SLE can generate streamwise counter-rotating vortex pairs (CVPs). These CVPs induce downwash flow, resulting in a decline in height of the leading-edge separated flow, thus attenuating roll oscillations. Force measurement results suggest that by choosing the appropriate wavelength-to-amplitude ratio of the SLE, self-induced roll oscillations can be suppressed with improved lift characteristics of the wing. Graphic abstract

中文翻译：

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使用正弦前缘控制低展弦比机翼的自诱导滚转振荡

摘要 使用正弦前缘（SLE）的仿生流动控制方法，在风洞设施中进行了衰减低展弦比平板机翼自致滚转振荡的实验研究。发现 SLE 对滚动衰减的有效性很大程度上取决于其幅度和波长。速度测量表明 SLE 可以生成流向反向旋转涡对 (CVP)。这些 CVP 引起下洗流，导致前缘分离流的高度下降，从而减弱横摇振荡。力测量结果表明，通过选择合适的 SLE 波长幅度比，可以通过改善机翼升力特性来抑制自感应滚转振荡。图形摘要