多棱柱绕流气动噪声试验研究
收稿日期: 2024-02-18
修回日期: 2024-03-31
录用日期: 2024-04-22
网络出版日期: 2024-05-08
基金资助
国家自然科学基金(12111530102);英国皇家学会基金(IEC/NSFC/201061)
Experimental study of aerodynamic noise of flow around polygonal cylinders
Received date: 2024-02-18
Revised date: 2024-03-31
Accepted date: 2024-04-22
Online published: 2024-05-08
Supported by
National Natural Science Foundation of China(12111530102);Royal Society International Exchange(IEC/NSFC/201061)
通过风洞试验开展多棱柱绕流远场气动噪声测试并进行分析。由于多棱柱存在离散边、点，试验在引入攻角影响后分别在角对来流及面对来流2种条件下进行。考虑多棱柱的应用场景，试验雷诺数选择在基于外接圆直径的亚临界雷诺数区间2×104~8×104进行。分析不同多棱柱构型的远场噪声功率谱密度（PSD）和总声压级特性规律（OASPL），并探索相较于圆柱是否存在降噪潜力。试验结果表明，多数多棱柱绕流产生以单个纯音为主导的噪声频谱，其总声压级符合基于偶极子噪声标度律的速度6次方定律，但边数为16的多棱柱在超过一定雷诺数后并不满足此规律，推测是由流动转捩造成。此外，边数为3和4的多棱柱在角对来流以及为5的多棱柱在面对来流时相较于圆柱有一定的降噪效果。
张栩齐 , 刘宇 . 多棱柱绕流气动噪声试验研究[J]. 航空学报, 2024 , 45(23) : 630292 -630292 . DOI: 10.7527/S1000-6893.2024.30292
In this study， wind tunnel experiments are conducted to investigate and analyze the far-field noise of the flow around polygonal cylinders within a Reynolds number range of 2×104–8×104. Considering the influence of angle of attack， two conditions are selected： flow incidence on corner or face. The characteristics of the Power Spectral Density （PSD） and the Overall Sound Pressure Level （OASPL） of far-field noise are analyzed. The potential for noise reduction compared to that of a circular cylinder is discussed. The results indicate that the majority of the flow spectra of polygonal cylinders are dominated by a pure tone， and the OASPL conforms to the sixth-power law of velocity based on the scaling law of dipole source. However， the sixteen-sided cylinder deviates from this law at high Reynolds number， suggesting the influence of transition. The triangular and square cylinders show some noise reduction effects for the corner orientation flow， while the five-sided cylinder exhibits noise reduction effects for the face-oriented flow.
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