Radiation efficiency of plates subjected to turbulent boundary layer fluctuations

Kou, Yiwei; Liu, Bilong; Chang, Daoqing

doi:10.1121/1.4949021

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…A comparison of the acoustic radiation of the plate with stationary fluid and convective fluid-loaded can be found in [11][12][13]. Graham [11] and Frampton [12] studied the influence of the mean flow on the modal radiation efficiency of a rectangular plate.…”

Section: Introductionmentioning

confidence: 99%

“…As a consequence, the acoustics radiation efficiency under the critical frequency of the plate would be higher. Kou et al [13] also conducted a research for the effect of convection velocity in the TBL on the radiation efficiency. Kou et al found that the modal averaged radiation efficiency will increase with the increase of the convection velocity below the hydrodynamic coincidence frequency.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

TBL-Induced Structural Vibration and Noise

Xilong¹,

Kou²,

Liu³

2020

Boundary Layer Flows - Theory, Applications and Numerical Methods

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One of most import noise sources in a jet powered aircraft is turbulent boundary layer (TBL) induced structural vibration. In this chapter, the general model for the prediction of TBL-induced plate vibration and noise is described in detail. Then numerical examples for a typical plate are illustrated. Comparisons of plate vibration and radiated noise between numerical results and wind tunnel test are presented. The effects of structural parameters on modal-averaged radiation efficiency and therefore the radiated noise are discussed. The result indicates that an increment of flow velocity will increase the acoustic radiation efficiency below the hydrodynamic coincidence frequency range. The main reason for this phenomenon is that a higher convection velocity will coincide with lower order modes which have higher radiation efficiencies.

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