多棱柱绕流气动噪声试验研究

doi:10.7527/S1000-6893.2024.30292

Abstract

Abstract:

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.

Key words: polygonal cylinder, aerodynamic noise, circular cylinder, dipole source, acoustics wind tunnel test

CLC Number:

V211.7

Xuqi ZHANG, Yu LIU. Experimental study of aerodynamic noise of flow around polygonal cylinders[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(23): 630292.

Figures/Tables 10

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References 24

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Experimental study of aerodynamic noise of flow around polygonal cylinders

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