Wake-aerofoil interaction noise control with trailing-edge serrations
Wake-aerofoil interaction noise control with trailing-edge serrations
复制标题
利用后缘锯齿进行尾流机翼相互作用噪声控制
DOI：
10.1016/j.expthermflusci.2021.110510
复制
发表时间：
2022
影响因子：
3.2
通讯作者：
Liu X
中科院分区：
文献类型：
--
作者：
Liu X
本研究实验研究了采用后缘锯齿有效降低串列翼型布局中尾流-翼型干扰噪声的问题。远场噪声结果清楚地表明，在“迎面”尾流撞击时，在前翼型后缘上使用锯齿形可以使尾流-翼型相互作用噪声显著降低约10 dB，而在其他频率和方向性图上没有任何明显的增加。随后，进行了详细的近场测量，以进一步研究与减少相互作用噪声相关的流动动力学。流场和非定常载荷结果表明，尾流-翼型干扰主要发生在靠近前缘区域的前30%弦长内，而朝向后缘，流动受边界层发展的影响更大。速度和壁面压力脉动谱表明，由于尾流湍流的后缘锯齿的修改后，在尾流-翼型相互作用的频率范围内的流结构的能量频率的内容显着减少。这导致非定常气动载荷的显著减小，特别是在升力方向上。进一步的压力-速度耦合分析表明，双锯齿通过在更宽的频率范围内传播它来修改与主导湍流涡旋相关的能量频率内容。近场到远场压力相干性也揭示了相干性的损失，从而减少了辐射的远场噪声。实验结果与转静叶和出口导叶的实际应用有关。
The present study experimentally investigates the effective reduction of wake-aerofoil interaction noise in a tandem aerofoil configuration using trailing-edge sawtooth serrations. The far-field noise results clearly show that at the ‘head-on’wake impingement, the use of sawtooth serrations on the trailing-edge of the front aerofoil can lead to substantial reduction of the wake-aerofoil interaction noise of approximately 10 dB without any noticeable increase at other frequencies and changes to directivity pattern. Subsequently, detailed near-field measurements were carried out to investigate further the flow dynamics associated with the reduction of the interaction noise. The flow field and unsteady loading results suggest that the wake-aerofoil interaction primarily takes place within the first 30% of the chord close to the leading-edge area, while towards the trailing-edge, the flow is influenced more heavily by the boundary layer development. The velocity and wall pressure fluctuation spectra show significant decrease of the energy frequency content of the flow structures over the wake-aerofoil interaction frequency range after the wake impingement, due to the modification of the wake turbulence by trailing-edge serrations. This leads to notable reduction in the unsteady aerodynamic loading, particularly in the lift direction. Further coupled pressure–velocity analyses reveal that the sawtooth serrations modify the energy frequency content associated with the dominant turbulence eddies by spreading it over a wider frequency range. Near-field to far-field pressure coherence also reveals the loss of coherence, and thus abatement of the radiated far-field noise. The experimental results are relevant to practical applications in rotor–stator and outlet guide vanes.
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作者：
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