Poro-Serrated Trailing-Edge Devices for Airfoil Self-Noise Reduction

Vathylakis, Alexandros; Chong, Tze Pei; Joseph, Phillip

doi:10.2514/1.j053983

Cited by 64 publications

(43 citation statements)

References 15 publications

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“…This concurs with the other observations made by Gruber [24] and Vathylakis et al [27], where the results show that jet flow through the serration valley corresponds to the high frequency noise.…”

Section: Introductionsupporting

confidence: 83%

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Aerodynamic Performance and Wake Development of Airfoils with Serrated Trailing-Edges

et al. 2017

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Section: Introductionsupporting

confidence: 83%

“…Vathylakis et al. [27] tested modified sawtooth serrated trailing-edges fitted on a NACA 0012 airfoil to reduce the high frequency noise observed in the previous tests. The space between the serrations (i.e.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Performance and Wake Development of Airfoils with Serrated Trailing-Edges

et al. 2017

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“…Although the porous material in this configuration is originally intended to American Institute of Aeronautics and Astronautics 3 eliminate the vortex shedding, the results in 11 show that it also has a potential to contribute in further broadband noise reduction. It is therefore hypothesised that the poro-serrated trailing edge could offer further reduction in the broadband noise level.…”

Section: Introductionmentioning

confidence: 95%

“…In the poro-serrated configuration, the main mechanism underpinning the broadband noise reduction is primarily associated with the serration geometry 11 . Although the porous material in this configuration is originally intended to American Institute of Aeronautics and Astronautics 3 eliminate the vortex shedding, the results in 11 show that it also has a potential to contribute in further broadband noise reduction.…”

Section: Introductionmentioning

confidence: 99%

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Aeroacoustic and flow assessments of the poro-serrated trailing edges

Chong

Dubois

Vathylakis

2016

22nd AIAA/CEAS Aeroacoustics Conference

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This paper reports an aeroacoustic study of a NACA0012 aerofoil with a nonflat plate type serrated trailing edge, and a number of Poro-Serrated trailing edge devices that contain porous materials of various air flow resistances at the gaps between adjacent members of the serrated sawtooth. Free field noise measurements were performed inside an aeroacoustic wind tunnel facility, where the range of jet speeds was between 20 ms -1 and 60 ms -1 . Flow measurements were also conducted in the same facility for the very near wake. The main objective of this work is to determine whether multiple-mechanisms on the broadband noise reduction can co-exist on a poro-serrated trailing edge. The results demonstrate that having low flow resistivity at the sawtooth gaps could not completely suppress the vortex shedding tone at low frequency, but it can achieve reasonably well broadband noise reduction at high frequency. With high flow resistivity at the sawtooth gaps, the denser porous material almost renders the poro-serrated trailing edge to becoming a straight trailing edge again, thus undermining the serration effect and causing a drop in the noise performance. The optimal range of flow resistivity for the poro-serrated trailing edge is found to be around 10 kN.s.m -4 , where it can even perform slightly better than the conventional serrated trailing edge in terms of the turbulent broadband noise reduction while still completely suppresses the vortex shedding noise. From the analysis of the wake data, the overall drag force will not increase when a poro-serrated trailing edge is used.

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Trailing edge serrations effects on the aerodynamic performance of a NACA 64₃418

Llorente

Ragni

2018

Wind Energy

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A study of the aerodynamic performance of a NACA 643418 airfoil with trailing edge serrations is presented. For the prediction of the changes in lift due to the serration installation, an empirical law is derived that can be extended to typical cambered airfoils for wind turbine applications. The law is deduced from 2D and 3D Reynolds‐averaged Navier–Stokes simulations (RANS) of the flow over the airfoil. Lift and drag together with the changes in the wake flow due to the presence of the serrated edges are investigated. An additional study of the sensitivity of the results at Rec = 3·106 with respect to the turbulence modeling is carried out by using three different RANS models: Spalart–Allmaras, k‐omega SST, and Transition SST. Results show that the changes in lift due to trailing‐edge extensions are approximated by the effect of a split plate with reduced length.

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Poro-Serrated Trailing-Edge Devices for Airfoil Self-Noise Reduction

Cited by 64 publications

References 15 publications

Aerodynamic Performance and Wake Development of Airfoils with Serrated Trailing-Edges

Aerodynamic Performance and Wake Development of Airfoils with Serrated Trailing-Edges

Aeroacoustic and flow assessments of the poro-serrated trailing edges

Trailing edge serrations effects on the aerodynamic performance of a NACA 64₃418

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Poro-Serrated Trailing-Edge Devices for Airfoil Self-Noise Reduction

Cited by 64 publications

References 15 publications

Aerodynamic Performance and Wake Development of Airfoils with Serrated Trailing-Edges

Aerodynamic Performance and Wake Development of Airfoils with Serrated Trailing-Edges

Aeroacoustic and flow assessments of the poro-serrated trailing edges

Trailing edge serrations effects on the aerodynamic performance of a NACA 643418

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Trailing edge serrations effects on the aerodynamic performance of a NACA 64₃418