在压力梯度流程中,具有不同比例的方形有限壁装气的航空声学
Chaoyang Jiang1, Con Doolan1, Charitha de Silva1
1School of Mechanical and Manufacturing Engineering, University of New South Wales (UNSW) Sydney, Sydney, New South Wales 2052, Australia.
The Journal of the Acoustical Society of America
|October 15, 2025
概括
这项研究揭示了尺寸比和压力梯度如何影响方形有限壁挂式气.
科学领域:
- 流体动力学 流体动力学
- 航空声学 航空声学
- 计算力学 计算力学 计算力学
背景情况:
- 方形有限壁挂圆柱体 (FWMCs) 是具有复杂空气声学行为的常见结构.
- 了解尺寸比和压力梯度的影响对于预测噪声产生至关重要.
研究的目的:
- 调查面积比和压力梯度对正方形FWMC的空气声学行为的综合影响.
- 识别不同的流动模式及其对岩层音色生成的影响.
主要方法:
- 同时进行远场噪声和不稳定的表面压力测量.
- 实验涵盖了三种压力梯度条件下的广泛的方程比率 (0.25到20):有利的 (FPG),接近零的 (ZPG) 和不利的 (APG).
主要成果:
- 在ZPG下,根据尺寸比,确定了三种模式 (R0,RI,RII),与风色调的存在相关.
- 通过消除压力波动的相关性,APG将调节过渡转移到更高的尺寸比和减弱的岩层音色.
- FPG诱导了早期的岩层音调的出现,并引入了一种新制度 (RI') 完全抑制了音调,因为 decorrelation.
结论:
- 视角比和压力梯度显著调节方形FWMC的空气声学行为.
- 流量模式和气流的音色特征对压力梯度条件非常敏感.
- 这项研究确定了FWMC中岩层音色生成和抑制的条件.
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