Effect of serrated trailing edges on aerofoil tonal noise
A wall-resolved large-eddy simulation of a symmetric Joukowski aerofoil with a 12 % thickness at a Reynolds number of 250 000, a Mach number of 0.4 and zero incidence angle is performed in order to investigate the effect of using a serrated trailing edge on the acoustic feedback event that generates...
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| Veröffentlicht in: | Journal of fluid mechanics 2020-12, Vol.904, Article A30 |
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| container_title | Journal of fluid mechanics |
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| creator | Gelot, Matthieu B. R. Kim, Jae Wook |
| description | A wall-resolved large-eddy simulation of a symmetric Joukowski aerofoil with a 12 % thickness at a Reynolds number of 250 000, a Mach number of 0.4 and zero incidence angle is performed in order to investigate the effect of using a serrated trailing edge on the acoustic feedback event that generates a tonal noise. The acoustic feedback is investigated in detail to emphasise the interaction between the upstream travelling acoustic expansion wave and the laminar separation bubble. The simulation shows that the serrated trailing edges may result in a significant reduction of the tonal noise. This paper provides detailed investigations into the noise reduction mechanisms. The main finding is that the presence of a serrated trailing edge decreases the amplitude of the acoustic source pressure in the transitional region and gives rise to destructive phase interference in the wall pressure fluctuations in the vicinity of the trailing edge which weakens the acoustic feedback loop. |
| doi_str_mv | 10.1017/jfm.2020.724 |
| format | Article |
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R. ; Kim, Jae Wook</creator><creatorcontrib>Gelot, Matthieu B. R. ; Kim, Jae Wook</creatorcontrib><description>A wall-resolved large-eddy simulation of a symmetric Joukowski aerofoil with a 12 % thickness at a Reynolds number of 250 000, a Mach number of 0.4 and zero incidence angle is performed in order to investigate the effect of using a serrated trailing edge on the acoustic feedback event that generates a tonal noise. The acoustic feedback is investigated in detail to emphasise the interaction between the upstream travelling acoustic expansion wave and the laminar separation bubble. The simulation shows that the serrated trailing edges may result in a significant reduction of the tonal noise. This paper provides detailed investigations into the noise reduction mechanisms. The main finding is that the presence of a serrated trailing edge decreases the amplitude of the acoustic source pressure in the transitional region and gives rise to destructive phase interference in the wall pressure fluctuations in the vicinity of the trailing edge which weakens the acoustic feedback loop.</description><identifier>ISSN: 0022-1120</identifier><identifier>EISSN: 1469-7645</identifier><identifier>DOI: 10.1017/jfm.2020.724</identifier><language>eng</language><publisher>Cambridge, UK: Cambridge University Press</publisher><subject>Acoustic noise ; Acoustics ; Aerodynamics ; Airfoils ; Coordinate transformations ; Elastic waves ; Feedback ; Feedback loops ; Fluid flow ; Incidence angle ; JFM Papers ; Large eddy simulation ; Mach number ; Noise ; Noise generation ; Noise reduction ; Numerical analysis ; Oceanic eddies ; Reynolds number ; Simulation ; Trailing edges ; Viscosity ; Wall pressure</subject><ispartof>Journal of fluid mechanics, 2020-12, Vol.904, Article A30</ispartof><rights>The Author(s), 2020. 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The main finding is that the presence of a serrated trailing edge decreases the amplitude of the acoustic source pressure in the transitional region and gives rise to destructive phase interference in the wall pressure fluctuations in the vicinity of the trailing edge which weakens the acoustic feedback loop.</description><subject>Acoustic noise</subject><subject>Acoustics</subject><subject>Aerodynamics</subject><subject>Airfoils</subject><subject>Coordinate transformations</subject><subject>Elastic waves</subject><subject>Feedback</subject><subject>Feedback loops</subject><subject>Fluid flow</subject><subject>Incidence angle</subject><subject>JFM Papers</subject><subject>Large eddy simulation</subject><subject>Mach number</subject><subject>Noise</subject><subject>Noise generation</subject><subject>Noise reduction</subject><subject>Numerical analysis</subject><subject>Oceanic eddies</subject><subject>Reynolds number</subject><subject>Simulation</subject><subject>Trailing edges</subject><subject>Viscosity</subject><subject>Wall pressure</subject><issn>0022-1120</issn><issn>1469-7645</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNptkDtPwzAUhS0EEqWw8QMssZJwbd8k9Yiq8pAqsXS3HD-qRElc7HTg3-OqlViY7vLdo3M-Qh4ZlAxY89L7seTAoWw4XpEFw1oWTY3VNVkAcF4wxuGW3KXUAzABslkQufHemZkGT5OLUc_O0jnqbuimPXV27xINE9UuBh-6gc5h0gOdQpfcPbnxekju4XKXZPe22a0_iu3X--f6dVsYhHouqjYXakWLZuUsGI_WCI4cLfBVa3AlKmOE1QKtdWCFqZhFK2XLM4xNJZbk6Rx7iOH76NKs-nCMuUVSHCtgKEGKTD2fKRNDStF5dYjdqOOPYqBOblR2o05uVHaT8fKC67GNXZ75l_rvwy94KmWa</recordid><startdate>20201210</startdate><enddate>20201210</enddate><creator>Gelot, Matthieu B. 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R. ; Kim, Jae Wook</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c406t-5b020b3b4c8ed0cf4dc32424d028bc4835cc3da34dde0d3c51d4d99b2d0c4753</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Acoustic noise</topic><topic>Acoustics</topic><topic>Aerodynamics</topic><topic>Airfoils</topic><topic>Coordinate transformations</topic><topic>Elastic waves</topic><topic>Feedback</topic><topic>Feedback loops</topic><topic>Fluid flow</topic><topic>Incidence angle</topic><topic>JFM Papers</topic><topic>Large eddy simulation</topic><topic>Mach number</topic><topic>Noise</topic><topic>Noise generation</topic><topic>Noise reduction</topic><topic>Numerical analysis</topic><topic>Oceanic eddies</topic><topic>Reynolds number</topic><topic>Simulation</topic><topic>Trailing edges</topic><topic>Viscosity</topic><topic>Wall pressure</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Gelot, Matthieu B. 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| subjects | Acoustic noise Acoustics Aerodynamics Airfoils Coordinate transformations Elastic waves Feedback Feedback loops Fluid flow Incidence angle JFM Papers Large eddy simulation Mach number Noise Noise generation Noise reduction Numerical analysis Oceanic eddies Reynolds number Simulation Trailing edges Viscosity Wall pressure |
| title | Effect of serrated trailing edges on aerofoil tonal noise |
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