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首页> 外文期刊>Aerospace science and technology >Effect of an excrescence in the slat cove: Flow-field, acoustic radiation and coherent structures
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Effect of an excrescence in the slat cove: Flow-field, acoustic radiation and coherent structures

机译：板条湾中的钝化效应：流场，声辐射和相干结构

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Slat noise during aircraft landing is already a barrier to the development of quieter commercial airplanes. Investigations have been made by several research groups to understand the mechanism of slat noise generation. Most of the published works related to slat noise consider clean idealized geometries, whereas real slats contain some imperfections to. enable its operation. The influence of a protrusion on the slat cavity surface on the unsteady flow around the slat and on the propagated sound was here investigated via numerical simulations. The protrusion models a sealing device designed to avoid metal-metal contact. A commercial code based on the Lattice-Boltzmann method was used to compute the unsteady flow. The far-field acoustic propagation was calculated by means of the Ffowcs Williams-Hawkings analogy and the Proper Orthogonal Decomposition (POD) was used to investigate the dynamics of the cove flow. The effect of the seal on the time-averaged pressure distribution is limited to the region close to it. However; tonal peaks in the noise radiated from the slat region are significantly higher when the seal is introduced. The present results show that, at the frequency of one of the tonal peaks, pressure fluctuations outside the cove are highly correlated with large-scale structures in the cove mixing-layer and at its impingement on the slat lower surface. The results also show that the introduction of the seal increases the coherence of these structures. (C) 2015 Elsevier Masson SAS. All rights reserved.
机译：飞机降落期间的板条噪声已经成为开发更安静的商用飞机的障碍。一些研究小组已经进行了调查，以了解板条噪声产生的机理。与板条噪声相关的大多数已发表著作都考虑了干净的理想化几何形状，而实际板条则存在一些缺陷。启用其操作。此处，通过数值模拟研究了突起在板条腔表面上对板条周围的非恒定流动和传播的声音的影响。突出部模拟了设计为避免金属与金属接触的密封装置。使用基于Lattice-Boltzmann方法的商业代码来计算不稳定流量。远场声传播是通过Ffowcs Williams-Hawkings类比法计算得出的，并且采用适当的正交分解（POD）来研究湾流的动力学。密封对时间平均压力分布的影响仅限于靠近它的区域。然而;当引入密封件时，从板条区域辐射的噪声中的音调峰值明显更高。目前的结果表明，在一个音调峰值的频率处，海湾外部的压力波动与海湾混合层中的大规模结构及其在板条下表面的撞击高度相关。结果还表明，引入密封件可以增强这些结构的连贯性。 （C）2015 Elsevier Masson SAS。版权所有。

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