Ducted Wind Turbines (DWTs) can be used for energy harvesting in urban areas where non-uniform inflows might be the cause of aerodynamic and acoustic performance degradation. For this reason, an aerodynamic and aeroacoustic analysis of DWTs in yawed inflow condition is performed for two duct geometries: a baseline commercial DWT model, DonQi®, and one with a duct having a higher cross-section camber with respect to the baseline, named DonQi D5. The latter has been obtained from a previous optimization study. A numerical investigation using Lattice-Boltzmann Very-Large-Eddy Simulations is presented. Data confirm that the aerodynamic performance improvement, i.e. increase of the power coefficient, is proportional to the increase of the duct thrust force coefficient. It is found that, placing the DWT at a yaw angle of 7.5°, the aerodynamic performances of the DonQi D5 DWT model are less affected by the yaw angle. On the other hand, this configuration shows an increase of broadband noise with respect to the baseline DonQi® one, both in non-yawed and yawed inflow conditions. This is associated to turbulent boundary layer trailing edge noise due to the turbulent flow structures developing along the surface of the duct.

中文翻译：

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偏航入流对涵道风轮机气动和气动声学性能的影响

管道式风力涡轮机 (DWT) 可用于城市地区的能量收集，在这些地区，非均匀流入可能是空气动力学和声学性能下降的原因。出于这个原因，对偏航流入条件下 DWT 的空气动力学和气动声学分析针对两种管道几何形状进行：一种基线商业 DWT 模型，DonQi®，以及一种具有相对于基线具有更高横截面弯度的管道，命名为东汽 D5. 后者是从先前的优化研究中获得的。介绍了使用 Lattice-Boltzmann 甚大涡模拟的数值研究。数据证实，气动性能的提高，即功率系数的增加，与管道推力系数的增加成正比。发现，将 DWT 置于 7.5°的偏航角，DonQi D5 DWT 模型的空气动力学性能受偏航角的影响较小。另一方面，在非偏航和偏航流入条件下，此配置相对于基线 DonQi® 显示出宽带噪声的增加。这与湍流边界层后缘噪声有关，这是由于沿管道表面形成的湍流结构造成的。