ACTA AERONAUTICAET ASTRONAUTICA SINICA >
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)
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.
Xuqi ZHANG , Yu LIU . Experimental study of aerodynamic noise of flow around polygonal cylinders[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2024 , 45(23) : 630292 -630292 . DOI: 10.7527/S1000-6893.2024.30292
| 1 | VON KáRMáN T. Aerodynamics： Selected topics in the light of their historical development［M］. Mineola： Dover Publications， 2004. |
| 2 | WILLIAMSON C. Vortex dynamics in the cylinder wake［J］. Annual Review of Fluid Mechanics， 1996， 28： 477-539. |
| 3 | ZPRAVKOVICH M M. Flow around circular cylinders： Volume 2： Applications［M］. Illustrated ed. Oxford： Oxford University Press， 2003. |
| 4 | CASALINO D， JACOB M. Prediction of aerodynamic sound from circular rods via spanwise statistical modelling［J］. Journal of Sound and Vibration， 2003， 262（4）： 815-844. |
| 5 | NORBERG C. Interaction between freestream turbulence and vortex shedding for a single tube in cross-flow［J］. Journal of Wind Engineering and Industrial Aerodynamics， 1986， 23： 501-514. |
| 6 | MARYAMI R， AZARPEYVAND M， DEHGHAN A A， et al. An experimental investigation of the surface pressure fluctuations for round cylinders［J］. Journal of Fluids Engineering， 2019， 141（6）： 061203. |
| 7 | PARNAUDEAU P， CARLIER J， HEITZ D， et al. Experimental and numerical studies of the flow over a circular cylinder at Reynolds number 3900［J］. Physics of Fluids， 2008， 20（8）： 85101-85101-14 . |
| 8 | XU S J， ZHANG W G， GAN L， et al. Experimental study of flow around polygonal cylinders［J］. Journal of Fluid Mechanics， 2017， 812： 251-278. |
| 9 | SKEWS B W. Autorotation of many-sided bodies in an airstream［J］. Nature， 1991， 352： 512-513. |
| 10 | SKEWS B W. Autorotation of polygonal prisms with an upstream vane［J］. Journal of Wind Engineering and Industrial Aerodynamics， 1998， 73（2）： 145-158. |
| 11 | BOSCH H R， GUTERRES R M. Wind tunnel experimental investigation on tapered cylinders for highway support structures［J］. Journal of Wind Engineering and Industrial Aerodynamics， 2001， 89（14-15）： 1311-1323. |
| 12 | MASOUDI E， GAN L， SIMS-WILLIAMS D. Large eddy simulation of incident flows around polygonal cylinders［J］. Physics of Fluids， 2021， 33（10）： 105112. |
| 13 | MASOUDI E， SIMS-WILLIAMS D， GAN L. Flow separation from polygonal cylinders in an incident flow［J］. Physical Review Fluids， 2023， 8： 014701. |
| 14 | WANG Q Y， XU S J， GAN L， et al. Scaling of the time-mean characteristics in the polygonal cylinder near-wake［J］. Experiments in Fluids， 2019， 60（12）： 181. |
| 15 | WANG Q Y， GAN L， XU S J， et al. Vortex evolution in the near wake behind polygonal cylinders［J］. Experimental Thermal and Fluid Science， 2020， 110： 109940. |
| 16 | IGLESIAS E L， THOMPSON D J， SMITH M G. Experimental study of the aerodynamic noise radiated by cylinders with different cross-sections and yaw angles［J］. Journal of Sound and Vibration， 2016， 361： 108-129. |
| 17 | PORTEOUS R， MOREAU D J， DOOLAN C J. The aeroacoustics of finite wall-mounted square cylinders［J］. Journal of Fluid Mechanics， 2017， 832： 287-328. |
| 18 | YANG Y N， LIU Y， LIU R， et al. Design， validation， and benchmark tests of the aeroacoustic wind tunnel in SUSTech［J］. Applied Acoustics， 2021， 175： 107847. |
| 19 | WELCH P D. The use of fast Fourier transform for the estimation of power spectra： A method based on time averaging over short， modified periodograms?［J］. IEEE Transactions on Audio and Electroacoustics， 1967， 15（2）： 70-73. |
| 20 | INOUE O， HATAKEYAMA N. Sound generation by a two-dimensional circular cylinder in a uniform flow［J］. Journal of Fluid Mechanics， 2002， 471（1）： 285-314. |
| 21 | BAI H L， LU Z B， WEI R K， et al. Noise reduction of sinusoidal wavy cylinder in subcritical flow regime［J］. Physics of Fluids， 2021， 33（10）： 105120. |
| 22 | GEYER T F， SARRADJ E. Circular cylinders with soft porous cover for flow noise reduction［J］. Experiments in Fluids， 2016， 57（3）： 30. |
| 23 | PHILLIPS O M. The intensity of Aeolian tones［J］. Journal of Fluid Mechanics， 1956， 1： 607-624. |
| 24 | GEYER T F. Experimental evaluation of cylinder vortex shedding noise reduction using porous material［J］. Experiments in Fluids， 2020， 61（7）： 153. |
/
| 〈 |
|
〉 |
CJA