On the optimum separation distance for minimum noise of contra-rotating rotors
On the optimum separation distance for minimum noise of contra-rotating rotors
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DOI：
10.1016/j.jsv.2022.117032
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发表时间：
2022-05
影响因子：
4.7
通讯作者：
P. Chaitanya;P. Joseph;S. Prior;A. Parry
中科院分区：
文献类型：
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作者：
P. Chaitanya;P. Joseph;S. Prior;A. Parry
重叠转子系统目前用于一些城市飞行器，并将在未来的电力推进中变得越来越普遍，因为它们提供了最紧凑的平台体积之一。本文介绍了悬停状态下共轴对转旋翼构型的详细实验研究结果。研究中考虑的转子直径范围为14-18英寸，本研究中研究的叶尖马赫数范围为0.2。详细的参数研究进行调查的敏感性辐射噪声的轴向分离距离。已经确定了相对于转子直径D的最佳间隔距离z为0.25，由此获得最小的辐射噪声。本文探讨了这一最佳方案的原因，并讨论了同轴结构中各种相互作用噪声源之间的平衡问题。它还表明，最小的辐射噪声大致上被发现的气动效率是最大的。
Overlapping rotor systems are currently used on some urban flight vehicles and will become increasingly common in future electric propulsion, since they provide one of the most compact platform volumes per thrust. This paper presents the results of a detailed experimental investigation of co-axial contra-rotating rotor configuration at hover condition. A range of rotor diameters considered in the study are 14-18 inch and range of Tip Mach numbers investigated in the present study are 0.2. A detailed parametric study is performed to investigate the sensitivity of radiated noise to axial separation distance. An optimum separation distance z to rotor diameter D of 0.25 has been identified, whereby minimum radiated noise is obtained. The reason for this optimum has been explored and the balance between various interaction noise sources in co-axial configuration is discussed in the paper. It is also shown that the minimum radiated noise was roughly found where the aerodynamic efficiency is maximum.