This paper reviews several decades’ worth of research on the topic of slat noise arising from high-lift systems of commercial aircraft. A high-lift system is commonly used for providing additional lift by deploying the leading-edge slat(s) and trailing-edge flap(s) during the takeoff and landing phases of flight. Slat noise can be one of the main sources of airframe noise, along with the deployed landing gear, and airframe noise can be dominant during the approach phase when aircraft engine noise is reduced. This review synthesizes historical investigations related to the generation/radiation of slat noise, including both experimental and numerical approaches. Characteristics of noise and corresponding generation mechanisms have been well investigated, and numerical tools have been developed to predict noise levels. Scaling laws to map the results from models to real aircraft are proposed based on the combined analytical and experimental investigations. Noise-reduction technologies are also discussed.

中文翻译：

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高升力系统中的缝翼噪声


本文回顾了几十年来关于商用飞机高升力系统产生的缝翼噪声这一主题的研究。高升力系统通常用于通过在飞行的起飞和着陆阶段部署前缘缝翼和后缘襟翼来提供额外的升力。缝翼噪声以及展开的起落架可能是机身噪声的主要来源之一，并且在飞机发动机噪声降低的进场阶段，机身噪声可能占主导地位。本综述综合了与板条噪声的产生/辐射相关的历史研究，包括实验方法和数值方法。噪声的特性和相应的产生机制已经得到了很好的研究，并且已经开发了数值工具来预测噪声水平。基于分析和实验研究的结合，提出了将模型结果映射到真实飞机的缩放法则。还讨论了降噪技术。