使用稳定辅助方法优化螺旋的音调噪声)
Luca Abergo1, Beckett Y Zhou2, Alberto Guardone1
1Department of Aerospace Science and Technology, Politecnico di Milano, Milan 20156, Italy.
The Journal of the Acoustical Society of America
|July 23, 2025
概括
这项研究引入了一个有效的框架,以减少螺旋的音响噪声,以减少城市空中交通. 该方法显著降低了计算成本,同时实现了3dB的噪声降低.
科学领域:
- 声学 声学 在声学方面
- 计算流体动力学的流体动力学.
- 航空航天工程 航空航天工程
背景情况:
- 螺旋产生的音调噪声是城市空中移动 (UAM) 应用的一个重要问题.
- 需要有效的方法来优化螺旋设计以减少噪音,而不需要大量的计算资源.
研究的目的:
- 开发和验证一个有效的优化框架,以减少孤立螺旋的音响噪声.
- 通过使用稳定状态配方来实现显著的计算节省.
主要方法:
- 结合Ffowcs-Williams-Hawkings (FWH) 声学类比与雷诺兹平均纳维埃-斯托克斯 (RANS) 方程.
- 在旋转参考框架 (RRF) 中使用开源的su2解决器进行稳定状态模拟.
- 采用离散的辅助解决器进行灵敏度分析和自动形状优化.
主要成果:
- 在保持推力的同时,上游声压水平 (SPL) 降低了3dB.
- 基于RRF的音调噪声预测与时间分辨率模拟密切匹配.
- 优化始终将刀片的尖端确定为产生噪音的关键区域.
结论:
- 拟议的稳定状态RANS-FWH框架对于优化螺旋设计以减少音调噪声是有效的.
- 这种方法在UAM应用程序的不稳定模拟上提供了显著的计算优势.
- 叶片尖的几何结构是减轻螺旋音响噪声的一个关键因素.
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