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A Study of the Aeroacoustics of Swept Propellers for Small Unmanned Aerial Vehicles

机译：小型空中车辆扫掠螺旋桨流动研究的研究

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In recent years, small unmanned aerial vehicles (sUAV) have increased in availability and use in both public and commercial sectors. This increased use has the unfortunate consequence of introducing excessive noise into communities where the sUAV operate. With electric propulsion, the primary source of noise is the rotor/propeller used in contemporary multi-rotor configurations. In this paper, the aerodynamic and acoustic behavior of various swept propellers are examined with computational and experimental methods. We found the computational results suggested a slight increase in noise for swept propellers, but the thickness noise can be shaped by sweeping the blade. The aerodynamic tests showed no reduction in efficiency for any of the swept propellers, opening a path for acoustic optimization including blade sweep as a variable. The acoustic experiment, which was conducted outside, suggested tonal noise drops because of blade sweep. Testing should be conducted in anechoic wind tunnel before any definitive conclusions can be drawn from the acoustic experiments.
机译：近年来，小型无人驾驶飞行器（SUAV）在公共和商业部门的可用性和使用中增加。这种增加的使用具有遗憾的是将过度噪声引入苏瓦运行的社区的后果。通过电动推进，主要噪声源是当代多转子配置中使用的转子/螺旋桨。在本文中，用计算和实验方法检查各种扫掠螺旋桨的空气动力学和声学行为。我们发现计算结果表明扫掠螺旋桨噪声略微增加，但是通过扫描刀片可以成形厚度噪声。空气动力学测试显示任何扫掠螺旋桨的效率的降低，打开用于声优化的路径，包括叶片作为变量扫描。在外面进行的声学实验表明了由于叶片扫描的色调噪声滴。在从声学实验中抽出任何明确的结论之前，应在AneChoic风洞中进行测试。

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