尖端马赫数对螺旋噪声在边向飞行中的影响)
Abhishek Gautam1, Liam Hanson1, Djamel Rezgui1
1School of Civil, Aerospace and Design Engineering, University of Bristol, Bristol, BS81TR, United Kingdom.
The Journal of the Acoustical Society of America
|June 25, 2025
概括
在先进的空中交通中,螺旋噪声对倾斜速度非常敏感. 尖端上升的马赫数显著影响声音水平,特别是在边向飞行中,这对于电动垂直起降 (eVTOL) 飞机设计至关重要.
科学领域:
- 航空航天工程 航空航天工程
- 声学 声学 在声学方面
- 流体动力学 流体动力学
背景情况:
- 先进的空中机动性 (AAM) 使用电动垂直起降 (eVTOL) 飞机.
- 在eVTOL中的螺旋经历边向流动,呈现出独特的空气动力学和空气声学挑战.
- 了解边向飞行中的螺旋声学对于开发更安静的AAM解决方案至关重要.
研究的目的:
- 实验性地研究叶片尖的马赫数对螺旋声学特征的影响.
- 在边向飞行条件下分析空气动力学和空气声学性能.
- 为设计更安静,更高效的eVTOL螺旋提供数据.
主要方法:
- 在一个12英寸,双叶片螺旋上进行了空气声学和空气动力学测量.
- 各种尖端的马赫数 (MT) 从0.12到0.56.
- 在从0到24 m/s的各种输入速度范围内进行测试.
主要成果:
- 螺旋噪声对Mach数 (MT) 倾斜具有很高的灵敏度.
- 总体声压水平 (OASPL) 尺度,MT3-MT4在低MT (<0.3) 和MT6在高MT (>0.3) 时没有入流.
- 噪声扩大因观察者位置和流入速度而有显著的变化,在垂直和高流入条件下分别达到MT8和MT7.
结论:
- 尖端马赫数是一个关键参数,在边向飞行中控制螺旋噪声.
- 音调噪声在低流量时占主导地位,而宽带噪声在高流量时增加.
- 这些发现对于设计用于eVTOL应用的低噪音,高效的螺旋至关重要.
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