Acoustic comparison of propellers
Acoustic comparison of propellers
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DOI：
10.1177/1475472x16659214
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发表时间：
2016-07
影响因子：
1
通讯作者：
G. Barakos;Cs Johnson
中科院分区：
文献类型：
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作者：
G. Barakos;Cs Johnson
本文给出了螺旋桨绕流的计算流体力学结果，并对它们的气动性能和声学性能进行了比较。在对所采用的计算流体力学方法进行了一些验证之后，利用风洞实验对现代螺旋桨设计进行了评估。使用相同的基线叶片，通过在叶片轮毂处增加交错和叶片间角度的微小变化，将不同的螺旋桨组合在一起。采用的方法产生的结果显示，螺旋桨声学在每种设计产生的频谱和声学音级方面存在差异。更换轮毂的效果是在保持总体螺旋桨性能不变的情况下，在基线设计的音调之间产生频率。所采用的集线器改变的效果是在主导基线设计的基本叶片通过频率的谐波之间产生音调。对安装和未安装的叶片进行了比较，结果表明，叶片周围的机翼、机舱和机身对获得的噪声水平有影响，但对频率含量没有影响。对一个爬升情况的计算也显示了飞行条件对声学结果的强烈影响。
This paper presents the results of computational fluid dynamics for flows around the propellers and compares their aerodynamic performance as well as their acoustics. After some validation of the employed computational fluid dynamics method, using wind tunnel experiments, a modern propeller design was assessed. Using the same baseline blade, different propellers were put together by adding stagger at the blade hub and small variations of the inter-blade angle. The employed method produced results showing differences in the propeller acoustics regarding the frequency spectrum produced by each design and the level of the acoustic tones. The effect of changing the hub was to generate frequencies in-between the tones of the baseline design while keeping the overall propeller performance the same. The effect of the employed hub changes was to generate tones in-between the harmonics of the fundamental blade passing frequency that dominated the baseline design. Installed and un-installed blades were compared and the results show that the wing, nacelle and fuselage around the blades influence the obtained level of noise but not the frequency content. Computations for a climbing case also show the strong effect of the flight conditions on the acoustic results.