Aerodynamic Performance of Different Trailing-edge Serrations for High Reynolds Number Flows around Wing-flap System
In the present work different trailing-edge serration models are designed and their aerodynamic performances at realistic landing conditions around a wing-flap system are investigated. The serration model with the best performance is then introduced. The NLR 7301 wing and single-slotted flap is sele...
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| Format: | Article |
| Language: | English |
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Isfahan University of Technology
2025-02-01
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| Series: | Journal of Applied Fluid Mechanics |
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| Online Access: | https://www.jafmonline.net/article_2614_e358f23eb1b9fbbeddcb5c4e06603bc3.pdf |
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| author | S. Ahmadkhah A. Jahangirian A. Zarinvafa |
| author_facet | S. Ahmadkhah A. Jahangirian A. Zarinvafa |
| author_sort | S. Ahmadkhah |
| collection | DOAJ |
| description | In the present work different trailing-edge serration models are designed and their aerodynamic performances at realistic landing conditions around a wing-flap system are investigated. The serration model with the best performance is then introduced. The NLR 7301 wing and single-slotted flap is selected as reference geometry and three types of serrations in the form of sinusoidal, square, and triangular shapes are cut into the trailing edge of the main element. The flow at Mach number 0.185 and the Reynolds number 2.51 million is calculated by numerical solution of incompressible Navier-Stokes equations using k-ϵ realizable turbulence model. Results show that the serration has exceptional positive effects on the aerodynamic characteristics of the system by generating vortices that modify the flow structure downstream of the main airfoil. All serrated models experience a reduction in drag coefficient compared to the baseline model at incidence angles before stall. Additionally, the maximum lift coefficients for all serrated models are increased. Among the serrated models, the sinusoidal serration exhibits the best performance with 6.8% increase in the maximum lift coefficient, a 10.6% decrease in the drag coefficient, and 2 degrees increase in the stall angle of attack of the wing-flap system compared to the baseline geometry. Moreover, the effect of wavelength on the performance of square shape serration is investigated and its aerodynamic advantages and disadvantages are presented. |
| format | Article |
| id | doaj-art-78d4ed1750cb4a0d973dc0cf5927d013 |
| institution | Kabale University |
| issn | 1735-3572 1735-3645 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj-art-78d4ed1750cb4a0d973dc0cf5927d0132025-02-09T07:16:04ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35721735-36452025-02-011841035104710.47176/jafm.18.4.29362614Aerodynamic Performance of Different Trailing-edge Serrations for High Reynolds Number Flows around Wing-flap SystemS. Ahmadkhah0A. Jahangirian1A. Zarinvafa2Department of Aerospace Engineering, Amirkabir University of Technology, Tehran, IranDepartment of Aerospace Engineering, Amirkabir University of Technology, Tehran, IranDepartment of Aerospace Engineering, Amirkabir University of Technology, Tehran, IranIn the present work different trailing-edge serration models are designed and their aerodynamic performances at realistic landing conditions around a wing-flap system are investigated. The serration model with the best performance is then introduced. The NLR 7301 wing and single-slotted flap is selected as reference geometry and three types of serrations in the form of sinusoidal, square, and triangular shapes are cut into the trailing edge of the main element. The flow at Mach number 0.185 and the Reynolds number 2.51 million is calculated by numerical solution of incompressible Navier-Stokes equations using k-ϵ realizable turbulence model. Results show that the serration has exceptional positive effects on the aerodynamic characteristics of the system by generating vortices that modify the flow structure downstream of the main airfoil. All serrated models experience a reduction in drag coefficient compared to the baseline model at incidence angles before stall. Additionally, the maximum lift coefficients for all serrated models are increased. Among the serrated models, the sinusoidal serration exhibits the best performance with 6.8% increase in the maximum lift coefficient, a 10.6% decrease in the drag coefficient, and 2 degrees increase in the stall angle of attack of the wing-flap system compared to the baseline geometry. Moreover, the effect of wavelength on the performance of square shape serration is investigated and its aerodynamic advantages and disadvantages are presented.https://www.jafmonline.net/article_2614_e358f23eb1b9fbbeddcb5c4e06603bc3.pdfwing-flap systemtrailing edge serrationaerodynamic performancehigh reynolds number flowturbulent flow |
| spellingShingle | S. Ahmadkhah A. Jahangirian A. Zarinvafa Aerodynamic Performance of Different Trailing-edge Serrations for High Reynolds Number Flows around Wing-flap System Journal of Applied Fluid Mechanics wing-flap system trailing edge serration aerodynamic performance high reynolds number flow turbulent flow |
| title | Aerodynamic Performance of Different Trailing-edge Serrations for High Reynolds Number Flows around Wing-flap System |
| title_full | Aerodynamic Performance of Different Trailing-edge Serrations for High Reynolds Number Flows around Wing-flap System |
| title_fullStr | Aerodynamic Performance of Different Trailing-edge Serrations for High Reynolds Number Flows around Wing-flap System |
| title_full_unstemmed | Aerodynamic Performance of Different Trailing-edge Serrations for High Reynolds Number Flows around Wing-flap System |
| title_short | Aerodynamic Performance of Different Trailing-edge Serrations for High Reynolds Number Flows around Wing-flap System |
| title_sort | aerodynamic performance of different trailing edge serrations for high reynolds number flows around wing flap system |
| topic | wing-flap system trailing edge serration aerodynamic performance high reynolds number flow turbulent flow |
| url | https://www.jafmonline.net/article_2614_e358f23eb1b9fbbeddcb5c4e06603bc3.pdf |
| work_keys_str_mv | AT sahmadkhah aerodynamicperformanceofdifferenttrailingedgeserrationsforhighreynoldsnumberflowsaroundwingflapsystem AT ajahangirian aerodynamicperformanceofdifferenttrailingedgeserrationsforhighreynoldsnumberflowsaroundwingflapsystem AT azarinvafa aerodynamicperformanceofdifferenttrailingedgeserrationsforhighreynoldsnumberflowsaroundwingflapsystem |