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首页> 外文期刊>The Aeronautical Journal >Assessment of surface roughness for a 'silent' aircraft
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Assessment of surface roughness for a 'silent' aircraft

机译：评估“静音”飞机的表面粗糙度

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Boundary-layer noise produced by rough surfaces is a potential contributor to airframe noise. In this paper, an attempt is made to assess the surface roughness noise for a conceptual Silent Aircraft design SAX-40 using a prediction model described in previous theoretical work (Liu and Dowling~((12))). Estimates of three idealised test cases show that surface roughness could produce a relatively high noise level and enhance the trailing-edge noise somewhat. Roughness height and roughness density are two significant parameters which affect surface roughness noise, with roughness height having the more dominant effect. The distribution of roughness noise sources decreases in the streamwise direction on the SAX-40 surface. Two candidate rough surfaces are selected for SAX-40 to keep surface roughness noise at a negligible level and to meet an aggressive noise target.
机译：粗糙表面产生的边界层噪声是机身噪声的潜在原因。本文尝试使用先前的理论工作（Liu and Dowling〜（（12）））中描述的预测模型来评估概念性静音飞机设计SAX-40的表面粗糙度噪声。对三个理想测试案例的估计表明，表面粗糙度可能会产生相对较高的噪声水平，并在某种程度上增强后沿噪声。粗糙度高度和粗糙度密度是影响表面粗糙度噪声的两个重要参数，其中粗糙度高度起主要作用。粗糙度噪声源的分布在SAX-40表面上沿流向减小。为SAX-40选择了两个候选粗糙表面，以将表面粗糙度噪声保持在可忽略的水平，并满足激进的噪声目标。

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