Semi-empirical Investigation of Trailing Edge Noise by Measuring Unsteady Surface Pressures

Document Type : Research Article

Authors

1 phd student / yazd university

2 phd student/ yazd university

Abstract

Turbulent boundary layer trailing edge noise is one of the main sources of aerodynamic noise and extensive studies have been devoted to trailing edge noise identification during the past decades. In the present study, for measuring the main parameters affecting the trailing edge noise including the surface pressure spectra, the spanwise length scale of the surface pressure fluctuations and eddy convection velocity in the trailing edge region, a flat-plate model equipped with several streamwise and spanwise surface pressure transducers is designed and built. The spanwise length scale and eddy convection velocity are calculated by simultaneously measuring of unsteady surface pressure in both streamwise and spanwise directions. The results show that the best collapses in the surface pressure spectra at low frequency and mid to high frequencies can be obtained by using outer and inner layer scales respectively. Furthermore, the longitudinal and lateral coherences can provide adequate information about the lifespan of the turbulent eddies and their physical size. Finally, the far-field trailing edge noise induced by the turbulent flow over the flat plate has been predicted by using the Amit-Roger model and results show the effectiveness of this model for prediction of far-field turbulent boundary layer trailing edge noise.

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 51, Issue 6
January and February 2020
Pages 1253-1270

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